あつあつ (atsuatsu) means “piping hot”

More examples

焼きたてのパンはまだあつあつです。ya ki ta te no pa n wa ma da a tsu a tsu de su

Freshly baked bread is still piping hot.

Describes food or another object as intensely hot, often with the sense that it has just been prepared or heated.

ほかほかhokahoka: Describes food or another object as pleasantly warm, often soon after being cooked or heated.

料理などが、できたてで非常に熱いさま。ryō ri na do ga de ki ta te de hi jō ni atsu i sa ma

あつあつ (atsuatsu) is the reduplicated form of あつい (atsui, "hot"), and the repetition intensifies the adjective's meaning.

The pattern あつあつの料理 (atsuatsu no ryōri) places あつあつ (atsuatsu) before a noun, while あつあつです (atsuatsu desu) places it at the end of a sentence.