Chili Lime Steak Fajitas

Bahan-bahan (4 porsi)

• 2 tablespoons olive oil
• 1/3 cup lime juice (freshly squeezed )
• 2 tablespoons fresh cilantro (chopped)
• 2 cloves garlic (crushed)
• 1 teaspoon brown sugar
• ¾ teaspoon red chilli flakes (adjust to your preference of spice)
• ½ teaspoon ground cumin
• 1 teaspoon salt
• 1 pound steak (rump, skirt or flank steak)
• 3 bell peppers (of different colours: red, yellow and green, deseeded and sliced)
• 1 onion (sliced)
• 1 avocado (sliced)
• 2 flour tortillas (optional)
• 2 lettuce leaves (for low carb option)
• 1 pinch cilantro (to garnish)
• 1 teaspoon sour cream (optional - to serve)