Thinly slice the onion and red pepper.
Heat a spoonful of olive oil in a frying pan and gently sauté the onion and red pepper for 5 minutes, then add the herbs & spices. Cut the tomatoes in half or quarters and add to the pan, then stir for a minute or so. Add a splash of water, if needed. The tomatoes should not get too soft!
Meanwhile, warm up the tortillas in an another flat pan or in the oven. Cut the avocado into chunks or slices, then drizzle some lime juice over them to prevent discolouring.
Take the tomato & onion mixture off the heat.
Divide the mixture between the tortilla sheets, spooning it in the middle of them. Top with avocado & jalapeno slices, then scatter some fresh herbs all over. Drizzle with some lime juice, then roll them up and serve.