Equipment
* optional
Ingredients
Vegetable Filling
- 200 g yellow summer squash, trimmed and cut into 1 cm cubes
- 200 g zucchini, trimmed and cut into 1 cm cubes
- 150 g sweet corn kernels, fresh cut from cob
- 100 g white onion, peeled and finely diced
- 1 jalapeno pepper, stemmed, seeded, and minced
- 3 garlic, peeled and finely minced
- 20 ml olive oil, liquid
- 3 g ground cumin
- 4 g fine sea salt
- 1 g ground black pepper
Tortillas and Cheese
- 8 corn tortillas, room temperature
- 120 g oaxaca cheese, shredded into thin strands
Garnish
- 15 g fresh cilantro, washed, dried, and coarsely chopped
- 1 lime, cut into 4 wedges
Nutrition (per serving)
Nutrition is estimated per serving. Nutrients without complete source data are omitted.
Full nutrition
- Calories
- 339 kcal
- Protein
- 14 g
- Carbohydrates
- 44 g
- Fat
- 14 g
- Saturated Fat
- 5 g
- Zinc
- 1.6 mg
- Vitamin A
- 84 mcg
- Vitamin C
- 42 mg
- Water
- 165 g
Sources: Aggregated Public Data, USDA FoodData Central
Method
Using a chef's knife on a cutting board, dice the yellow summer squash and zucchini into 1 cm cubes, finely dice the white onion, slice corn kernels cleanly off the cob, mince the jalapeño, and finely mince the garlic cloves.
Place a large cast-iron skillet over medium-high heat at 190°C (375°F) and add 20 ml of olive oil, tilting the pan gently to coat the entire base.
Add 150 g of sweet corn kernels into the hot skillet, spread them into an even single layer with a spatula, and sear undisturbed for 2 minutes at 190°C (375°F) until lightly charred.
Add 100 g of diced white onion and the minced jalapeño to the skillet, stirring with the spatula over medium-high heat at 180°C (355°F) for 3 minutes until softened and fragrant.
Add the diced yellow summer squash, diced zucchini, minced garlic, 3 g ground cumin, 3 g fine sea salt, and 1 g black pepper to the skillet, then sauté vigorously over medium-high heat at 180°C (355°F) for 4 minutes until tender-crisp.
Preheat a comal over medium heat at 175°C (350°F) and warm each corn tortilla for 30 to 45 seconds per side using tongs, stacking warm tortillas inside a clean kitchen towel to retain steam and pliability.
Scatter 120 g of shredded Oaxaca cheese evenly across the hot vegetable mixture in the skillet, remove the skillet from the heat source, cover with a heatproof skillet lid, and let rest for 1 minute until the cheese melts thoroughly into silky strands.
Uncover the skillet, spoon equal portions of the cheesy vegetable mixture into the center of the 8 warm corn tortillas, scatter 15 g of chopped cilantro over the top, and serve immediately alongside fresh lime wedges.
Chef's Notes
- Uniform 1 cm knife cuts for both squashes are essential to achieve a pleasant tender-crisp consistency without turning the dish into a purée.
- Letting the corn rest undisturbed directly against the hot cast iron provides a blistered char that complements the natural sweetness of summer produce.
- Oaxaca cheese is the premier choice for its mild acidity and stringy stretch; if unavailable, whole-milk low-moisture mozzarella or Monterey Jack makes an acceptable substitute.
- Stacking warmed tortillas inside a cloth towel uses trapped steam to ensure each taco wrap remains soft, bendable, and structurally sound during eating.
Storage
Refrigerator: 3 days — Cool leftover vegetable filling promptly and store in an airtight glass container within 2 hours of cooking. Store corn tortillas and cheese separately to avoid sogginess.
Reheating: Reheat leftover filling in a skillet over medium heat until steaming hot throughout and reaching a safe internal temperature of at least 74°C (165°F). Fill freshly warmed tortillas and top with fresh cheese.
Troubleshooting
Vegetable filling turns soggy and pools water in the skillet
Cause: The skillet was crowded, the cooking temperature was too low, or the squash was salted too early, leading to boiling rather than searing.
Fix: Tilt the skillet and spoon off pooled liquid, then increase heat to high for 1 to 2 minutes to rapidly boil off surface moisture before scattering cheese.
Prevention: Ensure the cast-iron pan is hot before adding squash, maintain medium-high heat, and avoid covering the skillet while cooking the vegetables.
Corn tortillas crack or break in half when filled and folded
Cause: Tortillas were insufficiently heated or allowed to cool and dry out in the open air.
Fix: Dampen clean paper towels lightly, wrap the cracked tortillas, and microwave on high for 15 seconds to restore moisture and flexibility.
Prevention: Warm tortillas thoroughly until steaming and pliable, then hold them enclosed within a clean cloth towel until serving.
Oaxaca cheese clumps into rubbery lumps instead of melting evenly
Cause: Pre-shredded cheese treated with starch anti-caking agents was used, or the skillet lost too much heat before being covered.
Fix: Return the covered skillet to low heat for 60 to 90 seconds until radiant heat softens the cheese completely.
Prevention: Shred fresh whole-milk Oaxaca cheese by hand from the block and cover the pan immediately while the filling is searing hot.
Cultural Context
This recipe is an adaptation of traditional Mexican calabacitas, a beloved homestyle dish composed of tender summer squash, sweet corn, and chilies sautéed together and frequently blanketed with regional melting cheese. Squash (Cucurbita pepo) has sustained Mesoamerican culinary traditions for millennia as an integral pillar of the milpa agricultural system alongside maize and beans. In modern Mexican home kitchens and fondas, these bright vegetable preparations effortlessly cross over from everyday family side dishes into satisfying taco fillings.
