What is Reddit's opinion of Amboy: Recipes from the Filipino-American Dream?

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I work through the rice by hand to remove all the clumps before cooking, and then add the soy and mix it into the rice prior to the rice going in the pan. Credit to Alvin Cailan for teaching me the technique. Amboy Cookbook

I don’t know, but my guess is you want to add some sugar like honey or agave. Marinades typically don’t use a lot of sugar because it will burn easily. Also you could improve the richness of flavor by adding some sake in it.

In case you want it here is Alvin Cailan’s recipe for Teriyaki Sauce from his Amboy Cookbook

¼ cup cornstarch 5 cups water 1 cup Datu Puti or Silver Swan soy sauce (see below; available at Asian markets and on Amazon) 2 cups loosely packed dark brown sugar 3 tablespoons honey 1½ teaspoons ground ginger 1½ teaspoons garlic powder In a liquid measuring cup, whisk the cornstarch into 1 cup of the water to make a slurry. Set aside. In a medium saucepan, stir together the remaining 4 cups water, the soy sauce, brown sugar, honey, ground ginger, and garlic powder. Bring to a simmer over medium-high heat. Make sure the mixture is simmering so that the heat will activate the cornstarch properly and thicken the sauce. Whisk the cornstarch slurry into the saucepan until the sauce thickens enough to coat the back of a spoon. Remove from the heat. Serve the teriyaki sauce right away or transfer it to an airtight container and refrigerate for up to 2 weeks.