Casserole Steak Salisbury

Bahan-bahan (5 porsi)

• 1 ½ pounds daging giling tanpa lemak
• garam dan merica (secukupnya)
• 3 tablespoons mentega tawar
• ½ cup diced onion, (about ½ medium onion)
• 8 ounces irisan jamur
• 2 teaspoons minced garlic, (about 2 cloves)
• 2 tablespoons all-purpose flour
• 1 ½ cups kaldu sapi
• 3 tablespoons saus Worcestershire
• 1 tablespoon apple cider vinegar
• 4 cups mashed potatoes, (store bought or fresh)
• 2 tablespoons unsalted butter, (cut into cubes)