Lunch will be falling from the heavens for the next three weeks.

Each Friday until the end of August, participants in the St Johns Cuban Air Raid will receive Cubano sandwiches delivered by parachute in secret central Wellington drop zones.

They won't know the mystery location until the morning of the drop.

St Johns general manager Rob Hill said the sandwich, which features free range ham and pork, with pickles, cheese and mustard on a crispy, warm baguette, was popular when it was served in summer, but it hadn't been part of the menu since.

He said this was a good way to bring it back.

"It's a bit of fun. We thought we'd do something a little different," Hill said.

The logistics of dropping 30 warm sandwiches from the sky were tricky.

"Google helped. You'd be surprised what you can find on there."

After a few Youtube tutorials, it was down to experimentation.

About 70 squashed sandwiches later, and the lunch launchers had the perfect design and building height to drop from.

The parachutes, made from children's plastic tablecloths and string, will, all going to plan, safely deliver the sandwiches into participants' hands.

The most the team has done in one day is 12. On August 14 they will drop 30.

"I'm just praying it's a calm day every Friday for the next three weeks.

"I'll definitely have some spares."

The mystery of the Wellington On a Plate event has proved popular. All three Fridays are sold out.

"I'll do it again. We're thinking of better and bigger ways of doing it."

Among those ideas was the possibility of using drones to deliver the food, Hill said.