How to Make Salisbury Steak with Mushroom Gravy, Diner Style

Ingredients

• 1 1/4 pounds ground beef (lean)
• 1/2 onion (small, finely chopped)
• 1/4 cup bread crumbs
• 1 egg (large)
• 1/4 cup milk
• 1/2 teaspoon dried thyme
• 1 tablespoon ketchup
• 1 to 2 teaspoons oil (for frying)
• salt and pepper to taste
• 2 to 3 cups mushrooms (sliced )
• 2 tablespoons flour
• 2 tablespoons ketchup
• 1 cup water
• 1 beef bouillon cube