How can I make a commercial brown sauce better-tasting?
I know that it's already very salty so making it healthier will be difficult, so what can I add it in it to make it taste better?
Are you talking about like the nasty knorr's powdered "demi glace" or better than bullion or even just the regular bullion? You really can't. I would suggest looking at something like french gourmet demi glace.
Or, the whole foods I went to the last place I lived, colorado springs, actually made their own and sold it. It was pretty good.
If you're talking about canned brown gravy, I find a little sugar balances out the saltiness and a pat of butter gives it a nice mouth feel.