In the meantime, wash the 2 lemons and 2 limes (preferably organic) with hot water, dry them well and rub the peel thinly. Mix 1/4 of it with 1 teaspoon salt. Cut the salmon fillet into strips and sprinkle with the lemon, lime and salt mix. Briefly fry the salmon strips with the chopped garlic cloves in oil. Then deglaze with the juice of half a lime, the cream and the vegetable stock. Add the remaining citrus peel and season with salt and pepper.
Drain the finished spaghetti, mix immediately with the sauce and serve sprinkled with lemon balm leaves.