It's a song about a stranger who meets a stranger. I guess that I will leave the rest of the story to your imagination.
I love the song because it lends itself to a male and female vocalist.
The woman repeats the chorus over and over again. ("Strawberry cherries and an angel's kiss in spring....my summer wine is really made from all these things.")
The man tells the story.
Nancy Sinatra and Lee Hazlewood recorded the original version of "Summer wine":