Place the 900g frozen shrimp in a bowl of cold water to thaw, then drain them thoroughly and set aside.
Wash 200g long-grain rice under cold water until the water runs clear, then drain well.
Wash 3 stems of celery and dice them into small, even cubes.
Peel the 4 cloves of garlic and mince them finely.
Peel the 250g onions and cut them into small, even cubes.
Slice the 800g white sausage into 1cm thick rounds. (This thickness helps them maintain their shape and brown nicely during frying)
In a medium container, dissolve 3 chicken stock cubes in 300ml hot water to create the chicken stock.
Open the 750ml tomato passata, as it will be used for deglazing later.