• Wash and dry all produce. • Halve lime. Trim and halve cucumber lengthwise; thinly slice crosswise into half-moons. Finely chop cilantro.

• In a small bowl, combine half the vinegar (you’ll use the rest later), juice from half the lime, ½ tsp sugar (1 tsp for 4 servings), and a pinch of salt. • Stir in cucumber. Set aside to quick-pickle.

• Heat a drizzle of oil in a large, preferably nonstick, pan over medium-high heat. Add carrots and cook, stirring, until just tender, 1 minute. Season with salt and pepper. • Turn off heat; transfer to a plate.

• Heat another drizzle of oil in same pan over medium-high heat. Add beef*; season with a pinch of salt and pepper. Cook, breaking up meat into pieces, until browned and cooked through, 4-6 minutes. • Stir in sweet soy glaze and remaining vinegar. Bring to a simmer, then immediately turn off heat. Taste and season with salt and pepper.

• In a second small bowl, combine mayonnaise with sriracha to taste. Season with salt. Stir in water 1 tsp at a time until mixture reaches a drizzling consistency.

• Wrap tortillas in damp paper towels and microwave until warm and pliable, 30 seconds. • Divide tortillas between plates and fill with saucy beef, carrots, pickled cucumber (draining first), and cilantro. Drizzle with sriracha mayo. Cut remaining lime into wedges and serve on the side.