Smoked Salmon Alfredo Sauce

1/4 onion, chopped
1/4 cup butter
1/2 pound smoked salmon, chopped
1 pint heavy whipping cream
1 tomato, diced
2 tablespoons chopped fresh parsley
ground black pepper to taste

Sauté onion in the butter in a pan until clear. Add the salmon and sauté at medium to low heat for approximately 2 more minutes. Very gradually, start to add the cream. Stir constantly until thickened. Sauce should be very thick once you have added all the cream. Top with tomato and parsley; season with pepper.