Start by dicing the onion into small uneven pieces and then chop the garlic and cilantro so everything is ready to go. The pile should look casual with mixed sizes and loose edges rather than perfectly uniform. Cut the lime into wedges and keep the toppings grouped separately so the colors already start to build. This first step gives you a clear shift from whole ingredients to a fresh prepped mix with visible green and white contrast.

Add the ground beef with the diced onion and garlic so the raw pink meat starts breaking apart and the onion begins to soften. As it cooks the beef changes from smooth clumps to smaller browned crumbles with glossy bits of onion tucked throughout. By the end of this step the mixture should look deeper in color with some darker browned edges and some lighter pieces still visible. The texture becomes loose and crumbly and the onion turns slightly translucent.

Sprinkle in the taco seasoning and pour in the tomato sauce and water so the browned beef turns from dry crumbles into a glossy red coated filling. The spices cling to the meat and the sauce settles into the gaps before thickening around each piece. After simmering the mixture looks richer and darker with a thicker texture and fewer loose juices. The beef should look fully coated with uneven saucy patches and a slightly sticky finish.

Warm the tortillas until they look softer and more flexible and then fold them around spoonfuls of the beef mixture. Top each taco with shredded cheddar and lettuce so the hot filling meets the cool crisp topping and the cheese starts to soften unevenly. The tacos should look casual and homemade with some fuller than others and some lettuce spilling out more than the rest. You want visible layers of warm beef and pale cheese and bright green lettuce in every taco.

Spoon salsa over the tops and scatter cilantro across the tacos so the final dish looks brighter and more finished. The salsa sits in uneven glossy patches and some drips lightly into the lettuce while the cilantro adds small green flecks across the plate. Serve with lime wedges on the side so the plate feels complete but still relaxed and homemade. The final tacos should show browned beef and slight cheese melt and crisp lettuce and non uniform color in every bite.