Hello dentman and welcome to the Addiction of homebrewing. The term ur looking for is wort (pronounced wert). And it is always a great idea to taste the sample and take notes about it. I also recommend tasting the raw ingredients also. This is how you learn what diff ingredients taste like and what they do to ur finished product. It's like a chef prearing his specialty dish. As far as the "burnt" flavor it will mellow out over time unless it was a truly overwhelming flavor. And there is several factors that this could've been. First always remove the pot from the heat before adding the malt extract. This not only helps prevent boilover, but it helps prevent the denser extract from being scorched on the bottom of pot before being stirred. Another thing could be when steeping the specialty grains tie ur steeping bag to the handle so it doesn't sink all the way to bottom of pot and lay there and scorch. Also some people claim that over squeezing the grain bag can release astringent flavors. And lastly the specialty grains in that recipe are very dark and bitter tasting like coffee, raw cocoa, or like bakers chocolate that have a somewhat strong bitter back taste that u may have perceived as a slight "burnt" flavor. Remember to get that dark color grain the malster toasts the grain to develop that strong complex toasted flavor, the darker the grain the more it was toasted. This just maybe a flavor you are not used to. But this is why I suggest tasting the ingredients and the wort at all diff stages. You will learn the ins and outs of the ingredients and the processes. 1 other thing you can do is look up "off flavors" in beer and it will list what causes different off flavors n how to prevent them. Remember it's your first brew , it's your beer, it will taste good and you improve from there. Good luck and welcome !