Beef fajitas with lime and beer marinade

Ingredients

• 1.5 lb beef flap, cut into thin strips against the grain
• 1/4 cup Honey Brown beer by Sleeman
• The juice of 2 limes
• 2 large garlic cloves, finely chopped
• 3 tablespoons olive oil
• 2 tablespoons Worcestershire sauce
• Salt and pepper from the mill
• 1 tablespoon cornstarch
• 2 teaspoon chili powder
• 1 teaspoon smoked paprika
• 1 teaspoon cumin
• 1 teaspoon salt
• 1 teaspoon brown sugar
• 1/2 teaspoon onion powder
• 1/2 teaspoon garlic powder
• 1 small sweet onion, cut in half and sliced ​​thinly
• 1/2 red pepper, cut into strips
• 1/2 green pepper, cut into strips
• 1/2 yellow pepper, cut into strips
• 4 large tortillas
• Sour cream
• Grated cheese
• Lettuce