Thinly slice the duck meat.
Julienne the cucumber.
Julienne the carrot.
Slice the onion thinly.
Blanch the duck meat in boiling water, then let it cool.
Put all the sliced vegetables and duck meat in a bowl.
Mix the mustard sauce (mustard, vinegar, sugar, soy sauce).
Evenly toss the sauce with the ingredients.
Plate the salad to finish.