Rule No1: Greeks love veggies. Rule No2: Veggies are healthy. Rule No3: Veggies can be sourced literally everywhere.
For travellers who are on the move, one of the easiest, cheapest & healthiest things they can cook is fresh veggies with any possible way. Raw, sautéed, stir-fried, baked, grilled and the list grows big. This is what I primarily do and this is how I manage to keep myself healthy & fit.