a peach of a
a peach of a (something)
An excellent, ideal, or exemplary type of thing. Thank you for that, Mrs. Dawkins, it was a real peach of a meal! They won the game in the final seconds with a peach of a field goal.
a peach of a —a particularly excellent or desirable thing of the kind specified. informal
Peach has been used since the mid 18th century as a colloquial term for an attractive young woman and more generally since the mid 19th century for anything of exceptional quality.
1998 Spectator Neil Pollard…rode a peach of a race…to win the two-mile marathon.