• 1 tablespoon olive oil
• 400g Italian or country-style sausages
• 1 red onion, chopped
• 1 1/2 cups arborio rice
• 2 celery stalks, diagonally sliced
• 400g can diced tomatoes
• 1 1/2 cups chicken stock
• 1 1/2 cups water
• 1/4 cup chopped fresh flat-leaf parsley, to serve

Method

1. Preheat oven to 200°C. Heat oil in a 12-cup flameproof casserole or ovenproofsaucepan over medium heat. Fry sausages for 10 minutes, turning until browned and almost cooked. Remove from pan.
2. Add onion to saucepan, and more oil if needed. Cook for 5 to 8 minutes until soft.
3. Slice sausages into bite-sized pieces.
4. Add rice and celery to saucepan. Cook for 1 to 2 minutes, stirring. Add sausages, tomatoes, stock and water. Stir. Remove from heat. Cover with the lid or foil.
5. Transfer dish to the oven and cook for 30 to 35 minutes or until almost all liquid is absorbed and rice is tender, but firm to the bite. Serve sprinkled with parsley.

Source (with comments):
http://www.taste.com.au/recipes/8845/oven+baked+sausage+and+tomato+risotto#null