Oysters Rockefeller

Ingredients

• 1 pound fresh spinach
• Vegetable cooking spray
• 2 tablespoons minced shallots
• 1 clove garlic, minced
• 2 tablespoons butter, melted
• 1/4 teaspoon salt
• 1/4 teaspoon pepper, divided
• 3 tablespoons butter
• 3 tablespoons all-purpose flour
• 1 1/2 cups half-and-half
• 1 tablespoon lemon juice
• 36 oysters on the half shell
• 1 (4-pound) package rock salt
• 8 slices bacon, cooked and crumbled
• 2 cups (8 ounces) shredded sharp Cheddar cheese