This is one of my fave slow cooker recipes.....

Ingredients (serves 4)
1 tablespoon olive oil
8 lean beef sausages
1 large brown onion, chopped
2 garlic cloves, crushed
2 eggplant, chopped
3/4 teaspoon chilli flakes
400g can diced tomatoes
1 cup chicken stock
1/4 cup flat-leaf parsley leaves, chopped

Method
Heat oil in a large non-stick frying pan over medium heat. Add sausages and cook, turning occasionally, for 2 to 3 minutes or until evenly browned. Remove to a plate lined with paper towel.
Add onion, garlic and eggplant to pan. Cook, stirring often, for 5 minutes or until eggplant is golden. Stir in chilli and tomatoes. Cook for 5 minutes or until sauce thickens.
Add stock and bring to the boil. Spoon eggplant mixture into slow cooker. Add sausages. Cover and cook on HIGH for 4 hours or LOW for 6 hours.
Stir in parsley. Season with pepper. Serve with steamed vegetables and crusty bread, if desired.


-- I have done it without pre cooking the veges, I normally add carrot and cannelini beans, and am pretty light handed with the chilli