Do you have a bigger bottle of this shochu?
Cooked sake is slightly higher in alcohol content. This is shochu, which I'm guessing gets cooked in some way during its production.
The reading for 焼 and 酎 are the on'yomi readings, but you didn't learn the reading for 焼 yet. That's okay, because if you know the (also English) word Shochu, you'll be able to remember the reading for this one as well too.