For the color at the end I add 2 tbsp tomato puree, you can replace 1 tsp tomato paste. Add salt and pepper to taste, if the sauce turns sour, you can add a little sugar. Put it out for a couple more minutes. Then put everything in a blender and whisk in the puree until smooth.
Remove the finished terrine from the mold, let it cool down a little, and then cut into portions, otherwise you will not be able to make it beautifully. Serve with sauce.