Posts Tagged ‘hack’

27th October
2012
written by scott

I love pumpkin carving – it’s my favorite part of Halloween.  This year, I decided to do something a little different with my jack-o-lanterns: animate them!  I was inspired by the guys at DigitalDudz, who came up with the very clever idea of brining Halloween t-shirts to live by taping your smartphone or tablet inside the shirt and playing a video that aligns to the image on the front of the shirt.  If it works for a t-shirt, why not a pumpkin?

The process is quite simple. 

  1. Start by picking a video that you want to incorporate into your pumpkin design. There are lots of videos on YouTube that will work, but I really liked the HallowEyes video pack ($6 CAD) from Hallowindow.com
  2. Next, pick the device that you’ll use to play the video.  Any digital device will work: an iPad or iPhone, any other smartphone, a Kindle Fire,  a digital picture frame that supports video playback… even a small monitor or pico projector connected to a laptop.  For extra versatility, consider using more than one device (ex. a smartphone for each eye).
  3. Load the video onto your device.  Then, lay a piece of paper over your device’s screen and trace the outline of the important part of the video.  In my case, I traced the outline of each eyeball.
  4. Pick the side of your pumpkin that you wish to carve.  Transfer the outline from the paper to the pumpkin by poking a series of small holes into the pumpkin around the lines on the paper.  Be sure to pick an area on your pumpkin where the device will fit nicely, remembering that most devices have a bezel that adds extra width.
  5. Cut a hole in the opposite side of the pumpkin, ensuring the hole is large enough to fit your device.  Scrape out the guts. 
  6. Put your video device in a clear plastic bag to protect it from the guts of the pumpkin.  Most touchscreens will still allow you to control them through a thin plastic bag.
  7. Make a small alignment hole where you want the video to appear.  In my case, I made a 1/2” hole in the center of each eyeball.  Insert your device with the video playing and check the alignment against those holes.  Then, working with a small amount of material at a time, scrape out the inside flesh of the pumpkin until your device fits against the inside wall.  Be careful not to scrape too far or you could puncture the inner wall of the pumpkin.
  8. Remove your device from the pumpkin.  Working from the outside face, gradually expand the alignment holes until they reveal the correct part of your screen.
  9. Finally, insert your video device one last time and hold it in place using toothpicks inserted into the inside flesh of the pumpkin.  Play the video (on repeat, if your device supports it).

If you liked this project, check out my primer on carving pumpkins with a laser,

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30th July
2012
written by scott

Update: Andris Lagsdin, fan of Modernist Cuisine and steel expert has just launched a Kickstarter for Baking Steel, a low-cost slab of pre-cut steel for baking pizzas and breads in just the way I describe below! I’ve tested one of his prototype units and it performs like a champ – even with a single Baking Steel (no double-decker) I was able to produce fantastic, wood-fired-oven-like results on my grill!  I highly recommend this Kickstarter for anyone looking to make pizza or breads at home.

The guys from Tested.com came to Seattle, so I shared with them one of the projects that’s been on my mind lately: making perfect pizzas at home.  In a previous post, I discussed my approach to making great pizza dough.  But, dough is only one half of the equation.  Without a good oven, the best dough in the world still won’t produce quality pizza.

Now, let me first say that there are people who devote their entire lives to pizza ovens – to building them, to studying them, and to understanding how they work.  I am not one of those people, and, although I still have a blank space in my yard that I one day hope to fill with an actual pizza oven, my goal here was to produce the best pizzas possible using my CharBroil infrared grill as a starting point.  But if you want to send me a pizza oven, I’ll test the shit out of it.

There are two keys to hacking a grill into an effective pizza oven: getting it really goddamned hot, and holding the heat.  Getting a grill hot is not so much of a challenge – add enough charcoal and let it burn for long enough, and you’ll have quite an inferno.  Add more airflow or additional oxygen, and your fire will burn hotter and faster.  But, retaining that high heat when you open the lid or add cold food… well, that requires mass.

Physics Interlude!

Mass, like a pizza stone, or the thick floor of a pizza oven, or in this case, 25-lb steel plates, act like a heat battery, storing up heat energy.  I was first turned on to the idea of using steel instead of ceramic brick by Modernist Cuisine, who recommend the technique not only for grills but for household ovens as well.  So, why are steel plates better than a pizza stone?  A few reasons:

  1. Steel is much denser than ceramic materials.  A typical pizza stone has a a density of 0.0625 lbs. per cubic inch.  The steel plates I’m using have a density of 0.329 lbs. per cubic inch – about 5 times as dense.  That means that for the same volume of material, I can store much more energy in steel than brick.
  2. Steel has a much lower specific heat than brick.  This means that it takes less energy to heat a steel block than a brick of equal mass.  So, the steel will heat up faster in the oven.
  3. Steel has a much higher thermal conductivity than brick.  Thermal conductivity measures how quickly heat moves through a material, or between materials via conduction. This means that the heat can move from the steel plate to the pizza crust faster than it could if I were using a ceramic material.

All of these factors are summed up in one convenient measure, known as thermal diffusivity.  And, it turns out that the thermal diffusivity of 304 steel (the grade I’m using) is about ten times greater than the thermal diffusivity of brick.  [I don’t have precise numbers for the ceramic composition of pizza stones specifically, but it will be similar in magnitude.  Some types of steel, like high-carbon steel, have more than 20 times the thermal diffusivity of brick.] 

Do ceramic pizza stones produce good-looking, great tasting pizzas?  Yes, absolutely.  But according to physics, they necessarily do so more slowly than steel.  One of my pizza criteria is a crunchy crust that will support its own weight when held from one end.  I’ve found great success in achieving this texture with a steel cooking surface.  The other advantage to steel, of course, is that it will last nearly forever.  I don’t have to worry about dropping and shattering it, I can use it as a griddle and scrape it clean, and if I need to build an impromptu blast shield, I’m all set.

To hack your grill into a worthy pizza oven, here’s what you’ll need:

To assemble your pizza oven:

  1. Place one of the stainless plates in a corner of your grill. 
  2. Place two of the stainless steel pipe segments on the two far corners of the plate.  Place the other two pipe segments on opposite edges of the plate, about 1/3 of the way back.  These pipe segments will hold up the top plate.  By pushing them back from the front corners, you allow yourself a little more room to negotiate the pizza with the peel.
  3. Place the top plate on top of the pipe segments.  It should sit firmly – you sure don’t want it crashing down on you during cooking.
  4. Install your BBQ grill fan or bellows on the opposite side of the grill, above the open grilling area not covered by the steel.
  5. If your grill has a charcoal tray or basin on the open side, fill it with charcoal.  If not, place the charcoal in a roasting pan or metal dish on that side of the grill.  Ignite the charcoal, turn on all of the burners and close the lid.  Allow the grill 45-60 minutes to preheat thoroughly. 
  6. A few minutes before cooking, start your grill fan or bellows.  This will boost the internal temperature of the grill and even out hot and cold spots.  A cooking temperature between 800°F and 900°F is ideal.
  7. Just before cooking, turn the burners below your steel plate down to 75% power.  This will help prevent the bottom crust from burning before the top crust is fully cooked.  However, I’ve found that the first pizza of the day is usually somewhat sacrificial :-)
  8. Slide your pizza onto the bottom steel plate and cook, turning once, for 2-3 minutes or until the cheese is melted and the top crust is golden brown.  Keep the grill lid closed as much as possible during cooking to maintain the high temperature.
  9. Enjoy extraordinary pizza made at home!

I hope you enjoy the pleasure of homemade pizza as much as I have.  I’ve probably made 50 or so pizzas this summer, and there is nothing quite as satisfying than pulling a perfect pizza out of the grill and serving it to friends.  If you don’t (or can’t) have a grill, this technique works pretty well in a home oven, too.  Place one steel plate on the bottom floor of your oven to act as a heat battery.  Set the other on the top rack. Preheat your oven for an hour on its highest temperature setting.  You’ll need to add a minute or two to the baking time, but the results will be worth it!

01st February
2010
written by scott

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I’ve recently been fascinated by the idea of sous vide cooking – a method of slowly cooking vacu-sealed foods in a precisely controlled water bath to achieve the optimal doneness.  Last year, Sur La Table started carrying the world’s first “home” sous vide cooker, the SousVide Supreme.  This was fantastic, since commercial sous vide cooking machines cost north of $2000.  However, the home model (priced at $450) is still a steep investment for something that essentially just keeps water warm.  I was determined that I could build a better device on-the-cheap.

Behold, the $75 DIY sous vide heating immersion circulator!  By scrapping together parts that are readily available on eBay and Amazon, I was able to build a self-contained device that heats and circulates water while maintaining a temperature accurate to .1 degree Celsius (yes, point one degrees!).  And unlike the SousVide Supreme, my device can be mounted onto any container (up to a reasonable size, perhaps 15 gallons) allowing you more room to cook, if needed.

To build your own device, you’ll need some basic soldering skills, the list of stuff below, about 6 hours of free time (plus time for glue to dry) and the can-do attitude of a geek who doesn’t want to pay $450 for a water heater.  Click the “more” link for complete step-by-step instructions.

If these instructions have helped you build you own machine, I hope you’ll consider donating.  My goal is to mass-produce the world’s first sous vide heating immersion circulator for under $100, and every donation helps!

Update: Along with my business partners, I’ve finally commercialized a home sous vide machine!  It’s called the Sansaire, and it’s available for pre-order now!
Sansaire $199 Sous Vide Machine

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