Chances are that the sweet taste comes from the malt used in Heineken (and other beers).
Malt contains starches that are easily broken down into simple forms of sugar (like Maltose) early on. Amylase enzymes present in your saliva start breaking down starch into sugars, leading to a sweet taste when drinking Heineken.
Why does the Saaz hop have a German name?
Along time back, the town of Žatec was part of Germany and not part of the now Czech Republic. Thus the name reflects an historical perspective rather than a cultural one.
Officially registered in 1952, the original Saaz, or Czech Saaz as it is sometimes known, has established itself as a staple variety for brewers ...
Gluten-Free beer recommendations?
Just as gluten intolerance will vary with individuals, so will recommendations for gluten-free beer recommendations vary as being preferred by individuals, at any given time.
As for myself, I too am gluten-intolerant (celiac), but taste is a whole different ballgame. I started out by going to the government liquor stores to ...
It's probably a combination of certain hops and yeasts. Some kinds of ale yeasts are known to add a plummy flavour to a beer (WLP500 for example). And also hops like golding or empire can go into this direction.
The dominant exotic fruit taste in e.g. IPAs usually also doesn't originate from actual fruits, but from hops and yeast.
Alcohol free beer is also a byproduct of whiskey distilling. Whiskey takes beer and distills the alcohol out of it. This alcohol they flavour and age in barrels to make whiskey. If you take what is left of that beer and force carbonate it and add hops, you are left with alcohol-free beer.