Ozark-style Venison Stroganoff

• 1 1/2 venison
• 1 marinade recipe for game
• 1 onion
• 1 garlic clove
• 350 ml sour cream
• 50 gr vegetable shortening
• 16 ml worcestershire sauce
• 1 ml sauce (hot)
• 1 gr salt
• 1 package mushrooms