Step 1

Using a knife or vegetable peeler, remove the brown outer layer of the celery root. Slice in half and remove any soft spots. Rub completely with a lemon or a splash of lemon juice.

Step 2

Shred celery root by hand or in a food processor with a shredding disc. Toss with 2 tsp lemon juice. Cover and rest for 30 minutes.

Step 3

Meanwhile, in a small bowl mix salt, mustard, sour cream, mayonnaise and black pepper.

Step 4

Coat shredded celery root with sauce, tossing to coat evenly. Cover and chill 1-2 hours.

Step 5

Add small mounds of mixture to a single piece of Boston lettuce.