Cook the pasta and then let it drain. Drain the tuna well on a sieve. Put a small saucepan (saucepan) on the stove and let it warm up a little when empty. Warm up the tuna in it. Pour in the sour cream and cream and heat carefully, but do not boil, otherwise the fish will overcook and you will not find it again.
Stir in 0.5-1 cube of herbal fix, dissolve and season the sauce with salt and pepper. Keep warm on the lowest flame until the pasta is ready.
Tip: Use fresh, mixed herbs instead of the herb fix, the most important thing is the dill.