Combine mustard, olive oil, vinegar, beef stock,
sugar, salt and pepper into a bowl and whisk well. This is your dressing.
Peel and slice the precooked knockwurst into strips. Cut onion into
thin rings. Dice the boiled potato. Slice the pickle thinly. Place
knockwurst, onion, potato, and pickle in large bowl. Pour dressing
over salad and toss gently. Refrigerate 2 hours. Peel and thinly slice
egg; mix with salad. Serve on lettuce leaves with a side of rye bread.
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