Grilled Ham and Gouda Cheese with Caramelized Onions and Roasted Tomato Mayonnaise

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Caramelized Onions:

1 tablespoon unsalted butter

1 tablespoon olive oil

1 large Spanish or sweet (Vidalia) onion, halved and thinly sliced

Salt and freshly ground black pepper

Roasted Tomato Mayonnaise:

1 plum tomato, halved and seeded or 2 sun-dried tomatoes in oil, drained and patted dry

1 tablespoon canola oil (if roasting tomato)

Salt and freshly ground black pepper

1/2 cup Hellmann's mayonnaise

2 cloves garlic, chopped

2 teaspoons fresh thyme leaves or 1/2 teaspoon dried thyme

8 slices good quality white bread (Pullman loaf) cut into 1/4-inch thick slices

1 1/2 cups grated Gouda cheese

Caramelized onions

8 slices prosciutto, sliced about 1/8-inch thick

8 tablespoons unsalted butter, at room temperature