Roasted Tomatoes with Stilton

Bahan-bahan (8 porsi)

• 12 medium (about 2¼ pounds) plum tomatoes
• 1½ teaspoons freshly ground black pepper
• ¾ teaspoon coarse kosher salt
• ½ teaspoon dried crushed rosemary
• 8 tablespoons olive oil, (divided)
• 2 large garlic cloves, (minced)
• 4 ounces Stilton cheese, (crumbled)
• 1 bunch watercress, (thick stems trimmed)