Many things can be cooked in them. Hotdogs, English muffins just to name a few. It may take a little longer to cook with them but they sure are worth it in the end.
Step 1: Materials.
1) Cardboard box - I used an old rollerblade box
2) Aluminum foil
3) Nontoxic glue or tape - I used Scotch Magic Tape 810
4) Black construction paper - I didn't have any of this so I used some black cloth
5) Plastic wrap
6) A pencil
8) Permanent Marker
9) Grill rack to put the food on
Step 2: Cut the top flap.
This top flap will become our reflector for the sun light.
Step 3: Line with aluminum & black cloth.
Take the black cloth or black construction paper and place it over the foil. Secure it with nontoxic tape or glue.
Step 4: Line lid with foil.
Step 5: Cover hole with plastic.
Step 6: Cover outside with black cloth.
Step 7: Place oven in the sun.
Leave the box in the sun for a half an hour to an hour to warm up. It may take a little longer depending on the heat and how clear the sky is in your area. Check on it every 15 minutes to see where it is at.