Team Lunch Ladies, a trio of Martha’s Vineyard cooks led by West Tisbury School chef Jenny DeVivo, are heading into the finals in the Food Network reality series The Great Food Truck Race.

Ms. DeVivo’s team, which includes Nisa Webster and Eli Carroll, has made it through five rounds of eliminations and will face team Mystikka Masala in the finals after team Super Sope was eliminated in last night’s episode, which took place in Santa Barbara, Calif.

This season of the Great Food Truck Race, its 12th, was recorded last summer and began airing in mid-March. The rolling contest began in the Los Angeles area before moving to San Diego, Palm Springs, Las Vegas and Santa Barbara. Each week, the food truck with the lowest amount in sales is eliminated from the competition.

In last night’s competition, team Lunch Ladies placed first place by a wide margin, fueled by watermelon donut holes and avacado influenced wraps. The winning team will receive a $50,000 prize.

The week before, in Las Vegas, the four remaining teams were challenged to produce, in 20 minutes, a room service meal worthy of a sumptuous, high-roller suite. Team Lunch Ladies earned praise from show host Tyler Florence and Olivier Dubreuil, executive chef of the Venetian, for their lettuce cups with Alaskan salmon.

The team also had to create a $5 signature dish with chocolate and make more money selling it than any of the other food trucks in the show, a challenge they won handily with deep-fried chocolate donut holes that customers devoured.

Served from their school-bus-yellow truck, Team Lunch Ladies’ regular menu — wrap sandwiches with beef or chicken, fries with aioli, and slaw — also was a hit on the Vegas Strip, as was Ms. DeVivo’s relentless hustle.

“Come on down to Lunch Lady town,” she called to every potential customer in sight, leading the hungry and curious to the truck where Ms. Webster handled the grill and Mr. Carroll took the orders.

The final episode airs Thursday, April 23, at 9 p.m. on the Food Network.