Normally apricots give up a lot of juice when baked, but these late-season ones didn't. Fruit varies in moisture but the nice thing about the layer of frangipane is that it keeps the tart dough crisp on the bottom, in case your fruit is juicy. You can use walnut or hazelnut flour in place of the
almond flour.
You can certainly use other fruits, such as sliced nectarines, peaches (peeled or unpeeled), plums, or figs. You'll need about 1 1/2 pounds (700g) of fruit. More important than precise numbers to follow, it's best to try to push the fruit as close together as possible, or if using sliced fruit, to overlap it as much as possible, because it'll cook down during baking.
You can also make this without the frangipane but you may want to sprinkle the bottom of the tart dough with some crumbled cookies, nuts or flour, or toss the fruit in 1 to 2 teaspoons of cornstarch if the fruit is particularly juicy, although I prefer using frangipane. That's why I gave you the recipe. (And because my "Lunar "Lint" recipe makes enough for 12 to 18 tarts.)
Update: A reader pointed out that ground almonds can sometimes be wanting in flavor, so I often add almond extract. The amount can vary, to taste, but since it's getting baked, you might want to err on the stronger side. (Although I know some people don't like that flavor when it's too strong.)
You can also swap out raspberries or blueberries for the cherries, using them to fill in the spaces between the fruit. I add the cherries at the beginning, but if using raspberries or blueberries, you can add them during the last 15 minutes or so of baking.
Just before baking the tart, I sprinkled mine with
organic cane sugar, which you can see in the photo. It's a little coarser than granulated white sugar. I like it because it doesn't melt so easily, and I enjoy the crunchy crystals in the crust. But feel free to use either regular granulated sugar, if that's what you've got. Just be sure not to be too stingy with it; the crackly crust (to some of us) with lots of juicy fruit tucked underneath, is the best part!