Use a natural hot spring to make this relaxing no cook meal.
Remove outer package (if comes in a box).
Place impenetrably sealed package into the hottest part of the hot spring. If the base of the spring is warmer than the surface, gently place rock or heavy object on top of food to weigh it down (be sure you don't puncture bag).
After 20 mins (average depending on water temperature) gently squeeze food package and feel for cold spots. Cook longer if needed.
When package is thoroughly warmed, gently open packages of food, but be sure you don't drink or add any hot spring water to your food.
Serve into bowls or eat right out of package.
Discard of all trash in proper manner. If you're hiking in, pack all trash out with you and Leave No Trace!
Here are a couple of tricks to successfully heat up your food in a hot spring.
1. The hotter the water, the faster and hotter the food will be. If your pool is cold, then your food will be cold.
2. Do not drink or use the hot spring water in combination with your food.
3. In some areas you can find small pools of scalding water near the tubs for people. Scout out the area before you jump in and look for other cooking locations.
4. Keep your spoon and bowls nearby so you won't have to get out of the water when its time to eat.