Mix together the garlic, fish sauce, soy sauce, salt, and sugar.
Marinate the chicken in a gallon sized ziplock bag for 4 hours, preferably overnight.
When ready to cook, preheat the oven to 350 degrees. Place the chicken on a rack on a baking sheet lined in foil. If using a whole chicken, roast for 60 minutes. If using chicken parts such as drumsticks, roast for 20 minutes a side.
While the chicken is roasting, you can start making the glaze. Heat up cooking oil in a small pan over medium high heat. Sauté the garlic cloves for 2 minutes until browned. Remove from the oil.
Add in the ground annatto seeds. Cook for 1 minute.
Set the glaze aside.
If using a whole chicken, brush with the glaze. Cook for 15 minutes. Brush with one more layer of the glaze and roast for another 15 minutes.If using chicken pieces like I did, turn on your oven’s broiler, keeping the oven rack on the second lowest level. Brush the top side with the glaze. Broil for 5 minutes. Flip the chicken. Brush with a layer of the glaze. Broil for another 5 minutes. Do these steps 1 more time. You should have 2 layers of glaze on the chicken by the time it’s finished cooking. Let rest for 10-15 minutes before serving.