There are perfect marriages in food as in life, and I’ve always found cranberries and hazelnuts to be such a marriage. For this tart, I used a hazelnut crust I’ve been experimenting with in the bakery and a simple old-fashioned filling that’s reminiscent of an early-American pie recipe I do in the spring with citrus. To revamp it for the holiday season, I used a vanilla bean and fresh cranberries instead. I think you’ll find it’s wonderful served with a dollop of whipped cream, but it’s perfect as is, too.
Make the crust:
Butter a 9-inch square tart pan with removable bottom. In a food processor, grind the hazelnuts by pulsing on/off for about 30 seconds until they’re a smooth medium-grind. They shouldn’t be too chunky but don’t go so far as to turn them into a paste either. Add the flour, sugar, and salt into the food processor and give them a quick pulse so they’re all blended together.
Add the butter and cut into the dry ingredients with an on/off pulse until mixture resembles coarse meal. Add egg yolk and 1 tablespoon ice water and blend until moist clumps form (don’t allow dough to form ball). If your mixture is still too dry, add another tablespoon of ice water. Press dough into bottom and up the sides of prepared pan. The crust should be about 1/4-inch thick. Cover and chill for 1 hour.
Preheat the oven to 350°F. After crust has chilled, bake until barely golden brown, about 15 minutes.
Make the filling:
In a small saucepan, melt the butter with the vanilla bean and scraped-out seeds. Cook over medium- heat until the butter starts to turn golden brown and smells toasty or nutty, about 4-5 minutes. You just successfully made brown butter! Remove from the heat and allow it to cool for 5 minutes. Remove the vanilla bean.
In a medium bowl, whisk the eggs with 1 cup of the sugar and the lemon zest. Slowly pour the brown butter into the egg mixture, whisking the entire time so as to not allow your eggs to cook. Whisk in the flour and salt. Pour the filling into the tart shell and bake for about 30-35 minutes, or until golden and set (not jiggly in the center). Transfer to a rack to cool, about 1 1/2 hours.
Meanwhile, in a saucepan, combine the remaining 3/4 cup of sugar with the cranberries and water. Bring to a simmer over medium-heat and cook until the cranberries just begin to pop and the sugar dissolves, about 5 minutes. Pour the cranberries into a bowl and refrigerate until cool, roughly 1 hour.
Drain the cranberries using a slotted spoon or a fine sieve and arrange them on top of the tart (the cranberry liquid will be discarded). Cut the tart into wedges and serve.
Note: This tart can be kept room temperature overnight and refrigerated up to two days.