Cold dreary days in the winter are always made a bit brighter by comfort food.
Preheat broiler to 400 degrees. In a bowl, mix the tuna, mayonnaise, pickle relish, Dill. Season with salt and pepper.
Place the bread slices on a baking sheet, and broil 1 minute in the preheated oven, until lightly toasted. Remove from heat, and spread with the tuna salad. Place 1 tomato slice over the tuna salad on each piece of bread then top with the cheese slices.
Return layered bread to the preheated oven, and broil 3 to 5 minutes, until cheese is melted and a little bit browned and bubbly. Garnish with the green onions.