President brie stuffed hamburgers & strawberry brie mini popovers

Ingredients

• 1 1/4 pounds ground beef
• 4 green onions , sliced, divided
• 2 teaspoons garlic, minced
• 1 tablespoon lemon juice
• 1 tablespoon olive oil
• 4 ounces Brie cheese, rind removed
• 4 tablespoons mayonnaise
• 4 kaiser rolls, split
• 1 tomato , cored and sliced
• 1/4 head Romaine lettuce, leaves separated
• coarse salt and freshly ground pepper, to taste