Difficulty: Summiteer (Level 3)
Food scientist Raquel Gomez and her team have developed a way to keep tortillas fresh for weeks without refrigeration.
This is important in poor Mexican communities. Tortillas are a key part of daily meals in Mexico, enjoyed by millions of people. Most Mexicans buy fresh corn tortillas from small neighbourhood shops.
The wheat flour version developed by Gomez and her team contains probiotics. Probiotics are live microorganisms found in yogurt and other fermented foods.
The fermented ingredients allow the tortilla to last up to a month without refrigeration. This is much longer than home-made tortillas.
It was created to help the most vulnerable people, said Gomez, who is a professor at the National Autonomous University of Mexico.
