Is this actually savory, or just "fancy sweet"?
It is dessert-first, but with savory depth. Miso brings a gentle saltiness and umami that makes the custard taste rounder, kind of like salted caramel energy without the sugar bomb.
What kind of miso should I use?
White miso (shiro) is best here. It is mild and slightly sweet. Avoid red miso unless you want a much stronger, saltier flavor.
Do I need a tart pan?
A tart pan with a removable bottom is ideal, but you can use a 9-inch springform pan in a pinch. Lightly grease the sides, line the bottom with parchment, and expect a slightly thicker, less clean-edged tart. Because springforms are deeper, you may need a few extra minutes of bake time to get the crust deeply golden.
How do I keep the crust from getting soggy?
Two moves: bake the crust until deep golden, and brush a thin layer of melted white chocolate on the cooled crust before adding custard. It sets into a moisture barrier and you generally should not taste it much if the layer is thin.
What fruit works best?
Go for a mix of soft and bright: berries, kiwi, mango, citrus segments, or thin-sliced stone fruit. Avoid super-watery fruit like melon unless you pat it very dry.
Can I make this ahead?
Yes. Bake the crust and cook the custard ahead, then assemble with fruit right before serving so everything stays crisp and glossy.