Bachelor Chow (See: Futurama). It doesn't have to be particularly tasty, but a simple meal that has 1/3 of your daily nutrition (with 1/3 RDA of all your vitamins and minerals) would be great. Preferably without ridiculous quantities of preservatives and artificial flavours.
1. Nutritional needs depend on age, time, body, activities, etc.
2. The desire for tasty food often greatly out-weights the desire for nutritional food.
3. Evolutionarily, we were designed to want more than what we need.