Takes about 15 minutes to prepare. Serve over boiled meats, roasted fish or vegetables.

Melt butter in a saucepan. Add onion and saute until translucent. Add flour and blend, stirring constantly - cook for a couple minutes so the final sauce doesn't taste like raw flour. Add dill and then whisk in chicken or vegetable stock. Bring to a boil and simmer until slightly thickened. When thickened, add the sugar, salt and pepper and vinegar. Remove from heat and stir in the sour cream.