Barbecued Venison Steaks

Ingredients

• 4 venison steaks
• 150ml (¼ pint) red wine
• 2 tbsps French wholegrain mustard
• 1 tbsp soft brown sugar
• 2 tbsps tomato purée
• 1 tsp chilli powder (or to taste)
• 1 small onion, sliced
• 2 cloves garlic, crushed
• Salt & freshly ground black pepper