Quesadillas Lentil Cepat dan Mudah

Bahan-bahan (8 porsi)

• one 28 ounce can diced tomatoes
• half a yellow onion
• 2 cloves garlic
• 1 1/2 teaspoons cumin
• 2 teaspoons chili powder
• 1 teaspoon salt
• 1 tablespoon oil
• 1 cup uncooked brown or green lentils, rinsed
• 1 cup uncooked brown rice, rinsed
• 2 1/2 cups vegetable broth
• 16 flour tortillas
• 3 -4 cups shredded Pepperjack cheese
• a few tablespoons butter (optional)