Ingredients:
1-2 dozen prawns
150g butter
500ml fish stock
500ml water
2 cans crushed tomatoes
1 onion, diced
3 cloves garlic, crushed
Method:
- Separate prawn heads/shells from the meat 

 - In a pot, melt butter and some oil. Add in prawn heads/shells until they start to pop

 - add in diced onion and garlic, cook til soft

 - add in tomatoes, stock, water. Mix well then let it simmer (covered) for 20-30 minutes 

 - Strain out the solid parts and put liquid back into pot

 - Add in prawn meat and cook until just cooked through

 - Serve over cooked pasta, using prawn heads as garnish if you wish
