Tip the tuna into a bowl with the spring onion, red onion and cheddar. Use a fork to flake apart the tuna and mix everything together. Add the mayonnaise, lemon juice, lots of pepper and a little ...
Even though the original tuna melt was a happy mistake ... those dishes where canned tuna is better than fresh, making super easy to whip up. But if you find that yours don't quite turn out ...
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.