Caramelized onions Canadian-style and a loaf of artisan-style olive bread give this toasted sandwich a deli-worthy flavour. Super quick and impressive.
Heat butter in a small frying pan over medium heat, and cook and stir onion for 3 minutes. Reduce heat to medium-low, stir in maple syrup, and cook until onions are soft and golden, 7 to 10 minutes.
Set oven rack about 8 inches from the heat source and preheat the oven’s broiler.
Stir together tuna and salad dressing in a bowl; season with salt and pepper. Slice bread loaf in half horizontally, then halve both pieces lengthwise, making four equal pieces. Place bread, crust-side down, on a baking sheet. Layer tuna mixture, onion, and Cheddar cheese evenly over bread pieces.
Broil in the preheated oven until cheese is bubbly, about 5 minutes.
Per Serving: 624 calories; protein 37.9g; carbohydrates 49.3g; fat 29.9g; cholesterol 96mg; sodium 1019.2mg.