1-First, prepare all ingredients by chopping the lettuce, onions, and pickles, and measure out the Big Mac sauce. Preheat a skillet or grill to medium-high heat to ensure even cooking.

2-Second, form the ground beef into thin patties slightly larger than the buns to allow for shrinkage during cooking, using the 1 lb of beef for two patties.

3-Third, cook the patties for about 3 minutes on each side or until they reach your preferred doneness, adding the 4 slices of American cheese on top during the last minute to melt perfectly.

4-Fourth, toast the 3 sesame seed buns lightly on the grill or in a toaster for added texture and flavor, which complements the fresh ingredients.

5-Fifth, assemble the Big Mac by spreading the 1/4 cup of Big Mac sauce on the bottom bun, followed by the shredded lettuce, finely chopped onions, pickle slices, and the first beef patty with cheese.

6-Sixth, add the middle bun layer and repeat the layering of sauce, lettuce, onions, pickles, and the second beef patty for that iconic double-decker feel.

7-Final, cap with the top bun, serve immediately, and enjoy. For dietary adaptations, substitute protein and bread according to preferences, like using plant-based patties, while keeping in mind regional differences in nutritional values.