Clean and wash the leek and tomatoes. Cut leek into rings, tomatoes into small pieces and cabanossi into slices. Peel garlic and press it through a garlic press. Wash and chop sage. Cook spaghetti in boiling salted water for about 10 minutes.
Steam leek in hot fat for about 8 minutes. Add tomatoes, sausage, garlic and sage and cook for another 3 minutes. Remove everything. Sweat the flour in the frying fat. Add stock and cream while stirring constantly, bring to the boil. Fold in pre-cooked ingredients and season to taste with salt and pepper. Drain spaghetti and let it drain. Arrange on a plate. Pour sauce over it.
Add stock and cream while stirring constantly, bring to the boil. Fold in pre-cooked ingredients and season to taste with salt and pepper. Drain spaghetti and let it drain. Arrange on a plate. Pour sauce over it. Serve sprinkled with olives and parmesan
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