Stroganoff burger

 

• Butter

• 1 pound ground chuck beef

• Salt and pepper

• 1 yellow onion, chopped (about 1 cup)

• 8 ounces sliced cremini mushrooms (can substitute sliced button mushrooms)

• 1/3 cup dry sherry, dry white wine, or water

• 1/2 cup chopped parsley, loosely packed

• 1 1/4 cups full fat sour cream, room temperature

• 1 teaspoon lemon juice

• 1/4 teaspoon paprika or more to taste