Beef Madras Curry

Ingredients

• 2 lbs sirloin steaks
• 1/4 cup ground coriander
• 6 teaspoons ground cumin
• 1 teaspoon mustard seeds, browned
• 1/2 teaspoon black peppercorns, creaked
• 1 teaspoon chili powder
• 1 teaspoon ground turmeric
• 1 teaspoon salt
• 2 teaspoons garlic, crushed
• 2 teaspoons fresh ginger, grated
• 2 -3 tablespoons white vinegar
• 1 tablespoon oil
• 1 medium onion, chopped
• 1/4 cup tomato paste
• 1 cup beef stock