The tuna melt is a classic ... type of bread to use for Open Faced Tuna Melts? There's no need to overcomplicate things by debating what type of bread to use for a sandwich. Use what you like ...

Top tuna with cheese, packing it on generously, and slide sandwiches under broiler. Broil until cheese melts and bubbles, 4-5 minutes. Remove tuna melts from broiler and serve immediately.