Add hot water to a small bowl and put the achuete seeds. Soak for at least 10 minutes then discard the seeds.
In a mixing bowl, combine pork, garlic, achuete water, soy sauce, cornstarch, paprika, black pepper, salt and sugar.
Mix the ingredients until well combined. Brush the funnel, rubber spatula, measuring cup with oil.
Then using a ice plastic bag, tie a knot to the closed end then insert the open end to the funnel nozzle.
Fill the funnel with 1/8 cup of the meat mixture and push the meat using the rubber spatula and when there is some left of the mixture on the funnel, push it with a thick wooden stick to push all the meat to the plastic casing.
Then remove the plastic casing from the funnel and push the meat downward and twist the open end of the casing to form the longganisa.
Prick the air bubbles with a toothpick to release the air. Then tie into a knot to seal the longganisa. Do the same procedure on the rest of the mixture.
Place the longganisa in a container and freeze overnight before cooking.
To cook the longganisa: Soak first in water then remove the plastic casing. Put a little water in a pan then put the longganisa.
Bring to a boil and simmer until the liquid evaporates and oil renders from the longganisa. Fry until brown. Serve with vinegar dipping sauce: mix chopped onions, vinegar, siling labuyo and crushed garlic.