Real Beef Stroganoff

Ingredients (12)

• 1 1/2 pounds beef tenderloin or sirloin, cut into 1 inch chunks
• 3 Tablespoons butter
• 1 large onion, sliced
• 8 ounces mushrooms, trimmed and sliced (I like cremini)
• 1/2 Cup chopped canned tomatoes
• 1 Cup chicken or beef stock
• 2/3 Cup sour cream
• 1 Tablespoon Dijon mustard (opt.)
• Salt and pepper
• Chopped parsley for garnish (opt.)
• 1 pound egg noodles
• 2 Tablespoons butter (or the noodles)