1) To make the crust: Combine all of the ingredients (except the sesame seeds) and mix and knead to make a smooth, soft dough, using a stand mixer, bread machine, or your hands.
2) Place the dough in a lightly greased bowl or large 8-cup measure (or leave it in the bread machine), and let it rise until it's very puffy, about 1 1/2 to 2 hours.
3) Spray a large rimmed baking sheet (a 13" x 18" half sheet pan is perfect) with non-stick vegetable oil spray. Sprinkle sesame seeds into the pan, if desired; they're there to mimic the burger's "sesame seed bun."
4) Gently deflate the risen dough, and stretch it into an oval in your hands. Plop the oval onto the baking sheet, and press it towards the edges. When it starts to fight back, walk away for 15 minutes. When you return, you should be able to press it to the edges and nearly into the corners. If you can't, give it another short rest, and try again. You want the dough to cover as much of the pan's bottom as possible (without making yourself too crazy about it).
5) Cover the dough, and let it rise until puffy, about 90 minutes. While the dough is rising, prepare the toppings. Season the ground beef with 3/4 teaspoon to 1 teaspoon salt, and fry until brown; drain off the fat. Dice the onions, and shred the lettuce.
6) To make the sauce: Combine all of the ingredients, mixing until smooth. Refrigerate until you're ready to use.
7) Towards the end of the dough's rising time, preheat the oven to 425°F.
8) Bake the crust for 10 minutes, or until it's a very light golden brown.
9) Remove the crust from the oven, and top it with the diced onion, then the ground beef. Return the pizza to the oven, and bake for 10 minutes.
10) Remove the pizza from the oven, and top with the pickle slices, then the sliced cheese. Return it to the oven, and bake for 10 minutes, or until the cheese is melted and the edges of the crust are brown.
11) Remove the pizza from the oven, and spread with the sauce. Finally, sprinkle with the shredded lettuce. Serve immediately.
Yield: 8 to 12 servings.