By popular request, Tucson Foodie has started a series of vegan meals on Mondays. Look out for our meat-free meal every so often on Monday.

If you’ve been down to MotoSonora Brewing Company in the past few months, you’ll notice a vintage trailer parked in the front parking lot — decked out in neon lights, shiny chrome, and old-school vibes.

What’s happening on the inside of the mobile diner is where the real treasure is, though. Substance Diner has created a vegan chicken sandwich that even meat-lovers can’t get enough of.

It’s called the Spicy Fricken Sandwich and, if you haven’t already, you’ve got to bite into its crunchy goodness sooner rather than later.

Between the sesame seed Kaiser roll bun is a scratch-made seitan cutlet, which is made of wheat gluten, and is then crusted in hot spices and deep-fried. On top of the savory cutlet is shredded lettuce, organic tomato, dill pickles, Frankenaise (spicy vegan mayo).

If you’re in the mood for an appetizer beforehand or while biting into the sandwich, consider ordering the Fried Pickles — arguably the best fried pickles in town.

You can find the food truck at MotoSonora Brewing Company from 3 – 9 p.m. on Monday – Thursday, 11 a.m. – 9 p.m. on Friday and Saturday, and 11 a.m. – 8 p.m. on Sunday.

Substance Diner is located at 1015 S. Park Ave. For more information, follow Substance Diner on Facebook or visit substancediner.com.