Carbonade Of Beef

Ingredients

• 2 Tbsp. butter
• 2 Tbsp. oil
• 3 lb. chuck or rump of beef, cut into slices 1/2 inch thick
• 1 1/2 lb. yellow onions, thinly sliced
• salt and pepper to taste
• 2 cloves garlic, crushed
• 1 bottle beer
• 1 c. beef stock
• 1 Tbsp. brown sugar
• bay leaf
• thyme
• parsley
• 2 Tbsp. cornstarch
• 2 Tbsp. vinegar