In a stove top pot, add all the ingredients for the marinate - Soy Sauce, Japanese Sake, Water, Swerve/Monkfruit, Bonito Flakes, and Diced Garlic - and bring to boil. Once boiling, reduce to simmer heat and let sauce reduce for 7-10 minutes or until slightly reduced. Once reduced, strain sauce with strainer and make sure to squeeze/press any excess sauce from the bonito flakes. Set aside. Note - if you are making more sauce, it will take longer to reduce. Note 2 - if you like stronger flavors, transfer some of the sauce into a reserve bowl and drizzle sauce before serving. Do not drizzle sauce you used for basting as it would be contaminated.