Sit-Down-Supper Hamburger

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SF Gate

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Ingredients

6 tablespoons butter

1 large onion, peeled, chopped

3 cups sliced mushrooms (about 12 ounces)

Salt

1/4 teaspoon pepper (or to taste)

1 pound ground beef

3/4 cup water

4 hamburger buns

2 bunches watercress, tough stems removed, washed, dried

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