This classic lemon tart has a buttery, shortbread crust and a soft, dense lemon curd filling that barely holds its shape when you cut a slice. The textures should be a combination of crunchy and velvety; the flavor, sharp and tangy, with just enough sugar to take the edge off the citrus. This version has all of that, with one tweak for ease. Instead of making a traditional dough that needs to be shaped with a rolling pin, this one has a simple press-in-the-pan cookie crust made with melted butter. For a nutty-scented brown butter crust, let the butter cook until it turns golden. This tart is at its best when served on the day it’s baked, but it’s still delightful a day or two later (though the crust will lose some of its crispness). Store it in the refrigerator and serve it cold or at room temperature.