1 pound beets
1 large shallot
Salt and freshly ground black pepper
2 teaspoons Dijon mustard, or to taste
1 tablespoon extra virgin olive oil
2 tablespoons sherry vinegar or other good strong vinegar
About 1 tablespoon minced parsley, dill, or chervil; or about 1 teaspoon minced rosemary or tarragon.