Del Taco Restaurants Inc. said Thursday it is expanding its partnership with Beyond Meat Inc. and will offer two new burritos containing that company's plant-based protein. The Mexican fast-food chain said it has sold almost two million Beyond Tacos and Beyond Avocado Tacos since adding those options to its menu in April. "The enthusiasm shown by our fans during the first weeks of our Beyond Meat offerings was undeniable," Del Taco Chief Executive John Cappasola said in a statement. The company is now adding the Beyond 8 Layer Burrrito and the Epic Beyond Cali Burrito to its menu at more than 580 locations across the U.S. Beyond Meat shares rose 2.5% premarket on the news. Del Taco shares were up 1.8% premarket and have gained 14.8% in the last 12 months, while the S&P 500 has gained 16.7%.