leaves stripped and finely chopped (a couple of tablespoons)
1 tablespoon McCormicks Montreal Brand steak seasoning", "1 navel orange (2 teaspoons of the zest reserved, then peeled and thinly sliced crosswise)", "1 teaspoon Worcestershire sauce", "2 teaspoons aged balsamic vinegar", "4 slices red onions (thick slicees)", "8 slices Fontina cheese (thin slices)", "2 cups shredded radicchio or 2 cups arugula or 2 cups Baby Spinach", "salt", "pepper
Instructions
Preheat a grill pan or grill to medium-high heat.
Drizzle the bread with olive oil; grill bread until toasted (1-2 minutes on each side); rub the garlic all over the bread.
Add the tuna to the container of a food processor; pulse until tuna is ground.
Transfer tuna to a bowl; add in the rosemary, steak seasoning, orange zest, Worcestershire sauce, vinegar, and a liberal drizzle of extra-virgin olive oil; mix to combine.
Brush the onion slices with olive oil and grill them 3-4 minutes on each side or until tender.
While the onions are cooking, get the burgers ready to go on the grill by forming 4 large patties.
Grill the patties with the lid down for 2 minutes on each side for rare and up to 5 minutes on each side for well-done.
A minute before taking the burgers off the grill, top with an onion slice and two slices of cheese.
Place the grilled bread on a platter; top with the orange slices, radicchio, and burgers.