Standing alongside Don Guerra, hands covered in flour and the sweet, yeasty aroma of sourdough rising from mixing bowls, is an education in baking and belonging.
At Agritopia’s open-air pavilion, Guerra stirs starter and warm water until frothy, inviting students to follow. Sonoran sea salt and his specialty Barrio Grains flour come next. Birds sing, garden chatter drifts by, and flour dust dances in the breeze.
“Every day, we’re new,” he says. “You can never reproduce the same loaf –– the temperature, the flour, your mood –– all have an effect. Set your intention, have a good mood and play good music.”
From Garage Baker to ‘Bread-ucator’
The James Beard Award-winning founder of Tucson’s Barrio Bread and Gilbert’s Barrio Bagel & Slice first sold bread from his garage. Today, his heritage-grain loaves, often stenciled with cacti and Arizona flags, regularly sell out. He’s earned two New York Times features and become Arizona State University’s first baker in residence.
A former math, health, physical education, and special education teacher, Guerra now teaches food systems, nutritional arts, and fermentation science.
“We all learn differently and I brought that into a bakery environment,” he points out. His mission extends beyond perfect crusts to food equity, agricultural resilience, and community connection.
Everyone Gets a Seat
Guerra’s Mexican and Irish heritage shaped his philosophy. Growing up, homemade tortillas and bread were necessities, not luxuries.
“How I view my bakeries is the same way my family would invite everyone for the holidays. You don’t have to be on the guest list. Get another chair from the shed and squeeze in. Everyone belongs, everyone is welcome. If there is abundance, share it.”
That generosity permeates his teaching.
As students stretch and fold dough, their hesitation disappears. Guerra calls gluten the “muscle of the bread,” guiding flour-covered hands toward the right texture.
Ancient Grains, Modern Mission
Working with Jeff Zimmerman of Hayden Mills and supported by a USDA grant, Guerra helped revive heritage Sonoran wheat, introduced to the desert by Spanish missionaries in the 1690s.
His first loaf was transformative. “I thought, ‘This is going to change everything,” he recalls. “It’s going to change all my baking; it’s going to change the economics of agriculture, my community, the gastronomy, and my family.”
Today, Guerra uses 16 desert-friendly grains, adding new varieties annually. His latest experiment? Tibetan Purple Barley.
For Guerra, bread isn’t merely sustenance. It’s culture, connection, and an economic lifeline linking farmers, millers, and neighbors.
“My passion is learning and sharing. I’m dedicated to being a baker on a global scale. Bread has opened up the world to me and I carry that.” For Guerra, the best bread doesn’t just rise. It lifts entire communities.
Insider Takeaways
- The 10,000-Student Club: Guerra has taught more than 10,000 people. His popular classes can fill within 30 minutes.
- Flour Isn’t Interchangeable: “Sonoran wheat is not a hard wheat. You can’t swap it for standard bread flour.” Each grain behaves differently.
- From Sonic to Sourdough: Barrio Bagel & Slice opened in a former Gilbert Sonic in March 2025, serving heritage-grain bagels, breads, sandwiches, and Sicilian-style pizza.
- Monsoon Meltdown: Arizona’s humidity once wreaked havoc on Guerra’s dough, forcing recipe adjustments midstorm.
- The Ancient-Grain Challenge: Einkorn nearly defeated him. “I almost lost my mind! It wouldn’t absorb water.” He eventually mastered a 100% einkorn loaf.
For more information, visit Barrio Bagel & Slice.
