Pressure cooker + HOT Rocks = delicious, and healthy cooking ???.
Put hot rocks inside a pressure cooker, add meat /or chicken, then lock it.
Now, you can kept for one hour or 5 hours, it keeps hot for long, and never over burn your meal. Also, it's movable, you can take it to a picnic with you while cooking.
Step 1: Preparation
1- some rocks (strong rocks; that do not crack with high temperature)
2- pressure cooker (big size is better).
3- aluminum foil.
4- any kind of tweezers for catching the hot rocks.
5- Chicken or meat ( in my example, I prepared two chickens stuffed with rice. also, I packed some Vegetables inside aluminum sheet)