serves 3-4 (yields 9 enchiladas), sauce adapted from Enchiladas
For the sauce:
1 1/2 lbs Roma tomatoes, quartered
2 serrano peppers, stemmed and halved (seeded and trimmed, if desired, to reduce heat)
2 cloves garlic
1/4 cup loosely packed cilantro
4 scallions, divided
1 no-salt added vegetable bouillon cube
1 TBSP olive oil
1/2 cup water
1/4-1/2 tsp fine sea or kosher salt, to taste
For the filling:
1 TBSP olive oil
1 18-oz tube prepared polenta
1 15-oz can black beans
freshly cracked black pepper
1/2 tsp fine sea or kosher salt
9 six-inch corn tortillas
chopped cilantro, optional
sliced scallion tops, optional
Heat oven to 350.
Begin with the sauce. Add tomatoes, peppers, garlic, cilantro, white and firm green portions of scallions (set tender dark green top aside), and bouillon cube to a food processor. Blend until smooth. Heat oil in a medium pot over medium heat and add sauce. Bring to a simmer and cook, stirring occasionally, for 10 minutes—the mixture will turn deep red. Add 1/2 cup water, reduce heat to medium-low and simmer, stirring occasionally, another 20 minutes. Salt to taste.
Meanwhile, divide tortillas into three stacks of three. Wrap each stack securely in foil and heat in oven for 20 minutes.
To prepare the filling, heat oil in a nonstick skillet over medium heat. Grate polenta into skillet and spread out. Let cook, undisturbed, for two minutes. Use a wide plastic spatula to flip polenta. Continue to let cook, flipping every couple of minutes, until fluffy and heated through, about 10 minutes.
Meanwhile, use the lid of the bean can to drain off excess liquid. Do not drain further. Add beans to skillet, add pepper, to taste, and salt, and flip the whole thing a few times to combine. Continue to let cook, flipping every couple of minutes, until beans are hot, about five minutes. Remove from heat and keep warm.
While the tortillas and sauce finish, chop scallion tops and cilantro to garnish, if using, and slice avocado. To serve, carefully open a foil packet (leave remaining stacks wrapped until you're ready to work with them) and take a warm tortilla from the top. Place a generous spoonful of filling just off-center, fold over, and repeat with remaining tortillas, working quickly. Pour or spoon sauce over top, garnish with scallions, cilantro, and avocado, and serve at once.