Wash the lettuce thoroughly and dry between layers of a clean kitchen towel or in a salad spinner. Keep aside.
In a pan, heat the oil. Saute the finely chopped garlic, ginger and green chillies for 1 minute or so.
Add all the chopped vegetables, and stir on a medium flame for 1-2 minutes.
Season with soy sauce, add 3-4 tbsp of water. Cover and cook until vegetables are cooked. Check for salt and add a little as required, as the soy sauce has already salted the veggie mix. Add the vinegar, finely chopped coriander and toss well. Remove from flame and cool to bring to room temperature.
Lay out the lettuce leaves in a dish or platter. Spoon 2-3 tsp of mix over each leaf. Top with fresh pineapple pieces and a sprinkling of fresh coconut.
You can also add roasted and crushed peanuts as a garnish.
How to eat: Just scrunch up the lettuce with toppings and eat it in one bite, or if you are feeling more adventurous, then two bites :D