Spare Ribs with Chocolate and Orange Sauce

Ingredients

• short ribs
• 1 cup red wine
• 1 medium yellow onion
• 1 clove garlic
• 2 ounces tomato paste
• 1 sprig thyme, fresh
• 3 bay leaves
• 1 quart chicken stock
• blood orange juice
• 0.5 cup sherry
• 0.25 cup shallots (about 2), diced
• 0.5 teaspoon salt
• 0.5 teaspoon white pepper
• 0.25 cup sugar
• 2 tablespoons unsweetened cocoa powder
• 2 cups beef broth
• 2 tablespoons unsalted butter