STEP 2/5
They're preparing bread now. Cut bagels in half and spread mustard sauce or ketchup or mayonnaise on both sides. The taste is delicious, but it also prevents the moisture from seeping into the ingredients.
STEP 5/5
Place sliced tomatoes on top, and some pickles on top. Place sliced onions on top, one drained lettuce, and then the other bread on top.