Trim the Treviso and the SalaCrisp^® and wash, shake dry, cut into small pieces and put into a bowl. Roughly chop the walnuts, cut the leeks into rings and add to the lettuce.<br/> For the dressing: Mix the white wine vinegar, salt, pepper and honey together. Add the mustard and beat. Then stir in water and oil. Drizzle the dressing onto the salad and toss carefully.