Prepare Chi-Chi's Chili con Queso according to the recipe linked to in the Box below. This is a 2 day recipe - So plan accordingly.
Place soy sauce, pineapple juice, garlic, salt and pepper in a sealable container or zip-lock plastic bag.
Add steak to marinade and seal.
Marinate the steak for at least 2 hours, shaking occasionally, prior to grilling.
Prepare Chi-Chi's Pico de Gallo according to the recipe linked to in the Box below. Set aside.
Remove steak from marinade. Discard marinade.
Grill steak to preferred doneness.
Remove steak from the grill. Slice thinly. Set aside.
Add garlic butter to a large skillet. Place over medium heat.
When butter is melted and hot, add red peppers, green peppers, yellow onions and mushrooms. Sauté until vegetables are semi soft and have a light golden color to them. Remove to a plate or bowl.
Lay a tortilla on a medium heat grill or large clean sauté pan placed over medium heat.
Top the tortilla with 1/2 portion each of the cheese, Chi-Chi's Pico de Gallo, sauteéd vegetables and grilled steak.
Allow to heat until the cheese has melted. Once the cheese has melted, fold the tortilla in half. Remove the tortilla from the heat and cut into four wedges.
Repeat with second tortilla and remaining 1/2 of ingredients.
Place the cut tortillas on a large serving plate.
Sprinkle with equal parts shredded lettuce and dollops of sour cream and guacamole.
Serve hot with Chi-Chi's Chili con Queso for dipping.