Because we all love tahini. And Harissa. Win-win situation.
Using a whisk, mix the sesame paste with the lemon juice and start drizzling the water until you get the consistency you desire; for salad dressing add more water, to spread on a sandwich keep it thicker.
Add the Harissa and salt to taste. Whisk to combine.
Cut a grain challah roll in half, generously spread the tahini, place a warm schnitzel on top, add sliced tomato, pickles and arugula