When I was a junior dev and was stuck on a problem (had to cap myself at 1 hour max because otherwise I'd spend the entire day) the first question my mentor asked was 'what have you found out?' and 'what is your thought process?' By regurgitating and trying to condense the things I figured out he could already point me to the right path and/or correct some wrong assumptions I made. It really helped me grow as a developer to not just be handed the answer.

But yeah, he did sit with me beforehand and explained how he mentors people.