This trick makes it possible for only a single food item
in your inventory be your unlimited source
of meals and boxed lunches! Basically, you can play through Skye mode with the same moldy 'ol clam that you dug out at the beginning of the game as your only source of food heh...
Here's the basics of how you do it...
1.) Make sure there is at least one food item in your inventory (bottled milk, coconut, freshwater clam...), AND make sure your inventory is not full.
2.) Now access the cooking area (right side of cave, behind Keith's sleeping area). It doesn't matter if you're making a boxed lunch or not, nor does it matter what cooking method you choose. Next is the important part....
3.) Time to put in some stuff for it to cook...
-- WITH THE +
move the cursor on the food item in your inventory to use for the trick. Press A to check it, AND THEN press B to uncheck it. (This select/unselect part is crucial because your game will freeze if you don't do this!!!).
-- Now, WITH YOUR STYLUS:
tap on the first empty slot in your inventory with your stylus so that the empty slot is now highlighted. Press the A button and you should see the empty slot is checked, and the topscreen shows you sent a duplicate of that food to one of the ingredient slots. You could then go ahead and choose other ingredients and spices to use (although I don't bother to).
4.) After you've set the food to cook, press X to start the cooking mini-game; play as you normally would. You can continue cooking more meals, just follow the same process of putting in the ingredients from Step #3.
In conclusion, it doesn't *really* matter what food you choose for the trick because it all mostly ends up being a carrot dish. Don't let the name fool you... A boxed lunch made w/ only a single ingredient yields 100% Hunger, and when used for the meals shared between Keith & Skye, it's at least 60% or even as high as 256% Hunger to both of you. And the food you used for the trick is still in your inventory in the end.