Prepare the cut veggies on a plate.
In a medium shallow bowl mix all the marinade spice mixture ingredients, reserve 2 tablespoons for the veggies later. Add the shrimp and toss until evenly coated. Cover and leave to marinate for 20-30 minutes in the fridge.
Toss the veggies with the reserved marinade.
Add a little cooking oil (I like to use avocado or grapeseed oil) in a large skillet over medium-high heat. Once the oil is hot, saute the veggies until softened but still crisp. Season with salt and pepper if needed in the end. Set aside.
Cook the prawns in the same pan with the marinade liquid. About 1 minute per side, just until you see the shrimp is becoming pink.
Return the veggies to the pan and stir until all mixed well and remove from heat. Season with more salt and pepper and a squeeze of lime juice. Serve hot in warm tortillas with toppings, some black pepper, and red pepper flakes.