Beef Vindaloo

Ingredients

• 1 kg chuck steaks or 1 kg blade steak
• 1 teaspoon black mustard seeds
• 1 teaspoon cumin seed
• 1 teaspoon ground coriander
• 2 teaspoons curry powder
• 1 teaspoon grated fresh ginger
• 2 cloves garlic, crushed
• 3 teaspoons vindaloo curry paste
• 1 1/2 tablespoons apple cider vinegar
• 1 tablespoon oil
• 1 tablespoon oil, extra
• 300 g onions, sliced (2 medium)
• 410 g canned tomatoes
• 425 g canned tomato puree