This tart is all about building layers of flavor. It starts with a base of ricotta and greek yogurt; a layer of gruyere cheese; and then a mixture of caramelized onions and sautéed, garlicky mustard greens. This same filling could work in a tart shell or even a galette, but in my mind the flaky, buttery puff pastry makes the perfect canvas. Note: the proportions below are for an 8 oz sheet of puff pastry; I'd recommend doubling the filling if you're using a sheet that's 14 oz. A sheet of Dufour puff pastry is 14 oz, and while pricey, it puffs up sky high and is completely worth the splurge.

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