Using peeler, shave cucumber into long, thin ribbons. When you've peeled to seeds, turn cucumber a quarter turn, and peel again. Continue peeling and turning until only seeds remain. Discard ends and seeds. Having trouble making ribbons? Feel free to instead cut cucumbers into ¼" rounds.
Peel and halve shallot. Slice halves into thin strips.
Halve lime. Quarter one half and juice remaining half.
Pat steak strips dry.
Pickle the Vegetables
Combine cucumber ribbons, shallot, 1 Tbsp. lime juice, and 1 Tbsp. water in a mixing bowl. Toss to coat.
Set aside to allow flavors to marry.
Make the Slaw
In another mixing bowl, combine slaw mix, mayonnaise, half the Sriracha (to taste) (reserve remaining for beef), 1 tsp. lime juice, and a pinch of salt.
Cook the Steak
Heat 2 tsp. olive oil in a medium non-stick pan over medium-high heat.
Add steak strips and stir occasionally until browned, 2-5 minutes.
Remove from burner and stir in teriyaki glaze and remaining Sriracha (to taste).
Stack tortillas on a microwave-safe plate, cover with a moist paper towel, and heat in microwave until warm, 30 seconds. Alternately, wrap tortillas in foil and heat in a 375 degree oven until warm, 4-5 minutes.
Assemble the Tacos
Plate dish as pictured on front of card, filling each tortilla with steak strips, slaw mix, and pickled vegetables. Serve with lime wedges on the side. Bon appétit!