But starting from this week, those lunchtime options are set to expand, all thanks to a line of food trucks.

The initiative is part of a push by the National Capital Authority to get more people into the triangle, as the weather starts to warm up.

Four food trucks will be parked on the Parkes Place Lawn for the remainder of the week. It will include offerings of Peruvian and Indian street food, pizza and French crepes.

The authority are trialing the food trucks in the precinct for the first week of every month for the next three months.

The authority's events and activation officer, Johanna Hamilton, said the food trucks were a way to get more people into the area with the arrival of spring.

"We wanted to get people out and about, and it was the perfect opportunity to create a real buzz in the area," Ms Hamilton said.

"People have been really enjoying it so far, and there's been quite a crowd."

Several hundred people were seen on Monday on the lawns near the food trucks, with long lines snaking back.

Among those in the line for a Peruvian chicken burger was public servant Alex Blanden, who said the food truck initiative was a good idea.

"It's been nice to have more options, especially in the parliamentary triangle," Mr Blanden said. "I'd like to see it get even bigger, it's been a good addition to the area. It sometimes gets a bit stale in the triangle, there's a few buildings and that's about it."

While the start of the trial only involved four food trucks, the authority said it was open to expanding the amount of food options, should it prove successful.

Ms Hamilton said a call-out had been placed to food trucks in the Canberra region.

"We'd be happy to rotate the type of food trucks we have and see how they go," Ms Hamilton said.

"At the moment we're hoping to do it for the first week of each month during the trial and see how that goes, and maybe we might open it up on a Friday night as well."

The authority said it wouldn't rule out expanding the food trucks to other parts of the triangle.