Arrange the Scoops side by side on a plate.
Mix the lettuce, tomatoes, and cheese in a medium bowl until well combined. Divide evenly among the Scoops (about 11/2 teaspoons per Scoop).
Stir 2 teaspoons water into the taco seasoning in a small bowl until it has no lumps. Set aside.
Preheat a small nonstick skillet over medium-high heat. Put in the beef. Use a wooden spoon to coarsely crumble the meat as it cooks. When the beef is no longer pink, after 1 to 2 minutes, stir in the seasoning mixture. When no liquid remains, after about 1 minute, remove from the heat.
Divide the meat evenly among the Scoops, atop the lettuce mixture (about 1 teaspoon in each). Dollop the top of each with taco sauce.
Serve immediately