Roasted Beet and Pickled Herring Salad with Mustard Buttermilk Dressing

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1 pound beets

1 tablespoon dry mustard

1 1/2 cups buttermilk

2 tablespoons coarse grain mustard

1/4 cup chopped dill

1 small red onion, halved and thinly sliced 

3 filets of pickled Herring, cut into 1-inch pieces

Bibb lettuce