Do side dishes at potlucks and cookouts ever give you trouble? They're trouble for me. The ideal potluck or cookout dish is one that's easy to make in bulk and inexpensive, and doesn't degrade with extended heating or reheating. I nominate frijoles charros—Mexican cowboy beans cooked with onions, garlic, tomatoes, salted pork, and chilies—as one superlative potluck dish.