Golden pork medallions with mushrooms recipe

Ingredients

• 1 1/2 pounds pork tenderloin, trimmed and cut into 2-inch rounds
• 2 tablespoons oil
• 1 tablespoon lemon juice
• Black pepper
• 1 small clove garlic, crushed
• Sauce:
• 6 ounces mushrooms, thinly sliced
• 1 onion, chopped finely
• 1/4 cup butter
• 2 tablespoons dry sherry
• Salt and black pepper
• 1/2 cup half-and-half