Heat the oil in a pan.
When the oil becomes hot, saute the garlic until it turns light brown.
Add the onion and chayote. Cook for 3 minutes.
Put-in sardines, water, fish sauce, and pepper. Stir. Cook for 3 to 5 minutes.
Transfer to a serving bowl. You can also top this over a cup of warm steamed white rice.
Serve. Share and enjoy!