Salisbury Steak with Savory Mushroom Gravy

Ingredients

• 1/2 medium onion (white, brown or yellow), grated
• 60 grams panko breadcrumbs or 40 grams plain breadcrumbs
• 500 grams ground beef
• 1 garlic clove, minced
• 1 large egg
• 2 tablespoons ketchup
• 1 beef bouillon cube, crumbled
• 1/2 teaspoon Worcestershire sauce
• 3 teaspoons dijon mustard or 2 teaspoons dry mustard powder
• 1 tablespoon olive oil
• 2 garlic cloves, minced
• 1/2 onion, finely chopped
• 150 grams mushrooms, sliced
• 30 grams unsalted butter
• 3 tablespoons (24 grams) plain flour
• 480 millilitres low sodium beef broth
• 120 millilitres water
• 2 teaspoons dijon mustard
• 2 teaspoons Worcestershire sauce
• Salt
• black pepper