The duo are part of the One Night Stand group, which returns to Edinburgh on Thursday with their show An Improvised Musical.

Los Angeles-born Jonah told the Jewish Telegraph: "I guess we planted the seed last year. We got a great reception."

The show sold out on its debut at the Fringe Festival last year and everything in the one-hour musical is completely improvised.

Jonah's father Marc, who is the executive producer, has worked for Hollywood studios and been involved in hit films such as Dances With Wolves and Silence of the Lambs.

Jonah, 21, said: "I grew up around entertainment and it is what I have been exposed to. But I have never had any pressure placed on me by my dad or been pushed into showbusiness."

Jonah founded the student improvisation troupe while at high school in LA seven years ago and the group has performed at a variety of venues across Hollywood.

He recalled: "I have been acting my whole life and got a group of us together.

"I also took improvisation classes in California and ran a programme for Jewish youth movement members at a summer camp."

At the beginning of each show, the performers ask the audience to suggest three things - the made-up title of a musical that has never been performed, a location where the musical will begin and the made-up name of a song that will appear at some point in the musical.

Jonah met Mollie, 22, when he formed the troupe at high school but, despite growing up in Los Angeles, she didn't have a showbiz upbringing.

Mollie recently graduated with a BA in psychology from Emory University in Atlanta, Georgia, and a minor in theatre studies.

While at university, Mollie joined Emory's only comedy improvisation group, and she directed too.

Despite their Los Angeles backgrounds, Jonah and Mollie had different Jewish upbringings.

Jonah went to Jewish day school until he was 13, was barmitzvah and went to synagogue regularly.

He said: "We kept kosher in the house and had separate dishes for milk and meat."

Mollie, the daughter of a Catholic mother and Jewish father, said: "I went to Hebrew school, but I also went to church. They basically left it up to me to decide what I wanted to do."

And she seems to be heading in the Judaism direction, having recently returned from the UJIA's Birthright Experience in Israel.

Mollie recalled: "It was definitely a chance for me to connect spiritually with Judaism. My mother is very interested in Judaism and works at the Museum of Tolerance in Los Angeles."

Other Jewish members in the troupe are Josh Margolin and music director Andrew Resnick.