It must be NO LONGER THAN 5 inches in length, 3 inches in width, and 2 inches in depthIt needs to hold 600 grams, too, which seems impossibleHelp please, I can use any materials.
I suggest a block of balsa wood from the local craft storeOr, a sheet of aluminum foil and some popsicle sticks.
On the BBQ about 20-25 minutes.
