Heat oil in a frying pan and cook sausages for about 8 minutes over medium heat until brown.
Add onion and garlic to the frying pan and cook until soft.
Add sausages, tomatoes, sachet of KNORR Country Hot Pot Dry Cook-in-Sauce and water to the frying pan and cook for 15 minutes until cooked through.
Add the peas, seasoning and herbs and cook for a further 5 minutes.
Pour into a casserole dish and top with mashed potato.
Dot potato with Stork margarine and place under the grill to brown.