Meat – How to add flavor to meatballs which taste stale from being frozen too long

20 or so minutes cooking the meatballs in the sauce has always done the job for me. You want to cook them sufficiently long so that they absorb the moisture and flavour of the sauce, but not too long such that they lose their firm texture. The reverse process of the meat flavouring the sauce is also an important one.

As a side note, it is more advisable to simmer the sauce, rather than boil it, or it will likely become too thick and may even burn.

In general, the combination of initially cooking the meatballs in the oven, and then simmering in the pan is the right way to do things. This ensures that the meatballs are sufficiently cooked, do not fall apart, and have the right firmness. Worth noting is that you should pad off the grease on the meatballs before putting them in the sauce.

This should be no problem. It is basically the same process as making a vinaigrette, only using water instead of vinegar, and lecithin instead of mustard. Here's how I would go about it. Let's say you have 1 cup of oil to emulsify. Go buy soy lecithin at a health food store. Take 1/2 cup of water, and dissolve 1 teaspoon of the soy lecithin in it. Use a blender or immersion blender. With the blender running, slowly drizzle in the cod liver oil. It will emulsify - the oil will disperse into ultra-fine droplets in the water, and presumably the taste will be both diluted and somewhat hidden by being locked up in little droplets. If this doesn't work, you just need more lecithin, so dissolve a bit more in another 1/4 cup of water and drizzle the whole thing back in to the blender.

Naturally you'll want to take 50% more, since the oil is now only 2/3 of the volume.

Those other ingredients are for flavor and anti-oxidation, not needed for the basic thing you are trying to accomplish.