Place a pot on medium heat and gently saute the onion, garlic and sausage in olive oil for 3-4 mins till the onions are soft.
Add the carrots, a little salt and cook covered for 3-4 mins till the carrots are really soft.
Now add the rosemary and the crushed tomatoes along with the juice and water/stock. Allow it to boil, then reduce the heat and simmer for 15 mins till all the ingredients amalgamate into a thick mixture. Season with salt.
Tip in the prawns and simmer for a further 5-7 mins just until they're cooked.
Serve warm, sprinkled with crumbled feta and drizzled with olive oil.