Make the annatto oil by combining 4 tablespoons of cooking oil and 1 teaspoon annatto seeds in a pan. Start heating the pan while gently stirring the oil. Turn the heat off once the oil shimmers. Continue to stir until the oil turns orangey. Remove the annatto seeds.

Using the annatto oil, sauté garlic until it browns.

Add the onion and the bottom part of the green onions. Continue to sauté until it softens.

Add the ground pork. Sauté until it browns.

Add 2 teaspoons fish sauce. Stir.

Pour 2 cups water. Cover the pot and let it boil. Reduce the heat to low setting. Boil the pork for 2 minutes.

Add the remaining water and let it boil.

Stir-in the chayote, and sotanghon noodles. Cook for 8 minutes.

Season with fish sauce and ground black pepper.

Transfer to a serving bowl and garnish with chopped green onion.

Serve hot. Share and enjoy!