Three-Cheese Quesadilla with Caramelised Onion
Crisp, golden and gloriously gooey
A quesadilla lives or dies on its cheese, so this one leans into three: sharp Cheddar for backbone, mozzarella for stretch, and mild Monterey Jack to bind it all into a molten centre. The twist is a tangle of slow-caramelised onion folded through, lending a deep, sweet note that plays beautifully against the salty cheese. Crisp without, gloriously gooey within, it comes together in under half an hour.
Three-Cheese Quesadilla with Caramelised Onion
Ingredients
- 2 large flour tortillas (about 25cm)
- 1 large onion, thinly sliced
- 1 tbsp olive oil
- 1 tsp soft brown sugar
- 75g mature Cheddar, grated
- 75g mozzarella, grated
- 50g Monterey Jack, grated
- 1 tbsp unsalted butter
- A pinch of sea salt
- Soured cream and coriander, to serve
Method
- Warm the olive oil in a frying pan over a low heat and add the sliced onion with a pinch of salt.
- Cook gently for 18-20 minutes, stirring now and then, until soft and golden. Stir in the brown sugar for the final two minutes, then set aside.
- Combine the three grated cheeses in a bowl.
- Lay one tortilla on a board. Scatter half the cheese over one half, spoon over the caramelised onion, then top with the remaining cheese.
- Fold the tortilla over to make a half-moon, pressing gently.
- Melt half the butter in a clean frying pan over a medium-low heat.
- Lay the quesadilla in the pan and cook for 3-4 minutes until the underside is crisp and golden.
- Add the remaining butter, flip carefully and cook the second side for a further 3-4 minutes until the cheese has melted.
- Slide onto a board, rest for a minute, then cut into wedges.
- Serve hot with soured cream and a scattering of coriander.
3 The Story
The quesadilla is one of Mexico’s oldest and most adaptable street foods, its name drawn from the Spanish word for cheese, queso. In its purest form it is simply a tortilla folded around melting cheese and warmed until soft, a dish that has fed market stalls and home kitchens across the country for generations. Regional habits vary wildly: in much of Mexico a quesadilla means a corn tortilla, while in the north wheat-flour tortillas, introduced through the territory’s wheat-growing tradition, are the norm. Famously, in Mexico City the question of whether a quesadilla must actually contain cheese remains a point of cheerful, unresolved debate.
The cheese itself is where this recipe takes its liberties. A traditional quesadilla relies on a single good melting cheese, often a stringy Oaxaca cheese whose texture recalls mozzarella. Here the principle is honoured but expanded into a trio chosen for what each contributes. Cheddar brings the sharp, savoury depth that an all-mild blend can lack. Mozzarella provides the dramatic pull, the long strands that make a quesadilla so satisfying to tear apart. Monterey Jack, a soft, buttery cheese that melts cleanly, smooths the two together and keeps the filling from turning oily.
Caramelised onion is the second departure, and it earns its place. Slowly cooking onion draws out its natural sugars through gentle browning, transforming its raw bite into something mellow, jammy and almost sweet. That sweetness is a natural foil for salty cheese, a pairing long understood by cooks far beyond Mexico. The key is patience and a low heat: rushing the onion over a high flame scorches the edges before the sugars have a chance to develop, leaving bitterness rather than depth. A whisper of brown sugar at the end is a gentle nudge, not a shortcut.
Cooking the finished quesadilla in butter rather than dry-frying gives the surface its lacquered, golden crust and a faint richness that oil alone cannot match. The result is a humble dish dressed up just enough to feel special, still quick enough for a weeknight, and endlessly forgiving of whatever good melting cheese happens to be in the fridge.
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