Most pear tarts are either a thin fruit tart — pears fanned over pastry cream — or a rustic galette. The bourdaloue is neither. Its defining feature is that the pears sit in a bed of almond cream, not on top of a custard, and the two bake together into one set, cake-like layer that still reads as a tart because of the crisp pastry underneath. The almond cream puffs gently around the pears as it bakes, cradling them, so each slice has three distinct textures in one bite: shatter-crisp shell, dense moist frangipane, and soft fragrant pear. That contrast — not any single flavor — is what the dish is famous for, and it is why the pears have to be poached and the shell has to be pre-baked. Get either wrong and the three textures collapse into one soggy one.

Raw pears are roughly 84 percent water. Bury them in almond cream and bake, and that water leaves as steam after the frangipane has started to set — steaming the cream from below, leaving it wet and pudding-like in the center, and pushing the bake time 15 minutes past the point where the top already looks done. Poaching drives off much of that water in advance, under your control, and does two other things at once: it softens the dense Bosc flesh to exactly the right give, and it carries vanilla and lemon into the fruit so the pear tastes seasoned rather than bland. You can poach the pears up to three days ahead — they actually improve sitting in their syrup overnight. The only non-negotiable after poaching is to pat them completely dry; surface syrup is just as damaging as raw-pear water.

The almond cream is wet and heavy. Spread it into a raw shell and the bottom crust never gets a chance to crisp — it sits under an inch of moist batter for 40 minutes and comes out pale and doughy. Blind baking (pre-baking the empty shell with weights, then a few minutes without) dries and firms the base before the filling goes in, so by the time the cream is set the bottom is already a crisp, flaky layer. Pull the blind-baked shell when it looks dry but is still barely colored — it picks up its final color during the second bake, and a shell that browns twice turns bitter and hard.

In strict French pastry terms, crème d’amandes (almond cream) is butter, sugar, almond flour, eggs, and a little flour beaten together; true frangipane is that almond cream cut with an equal part of pastry cream for a smoother, richer set. Nearly every bakery and home version of the tarte bourdaloue — including the Bourdaloue original — uses the plain almond cream, which is what most people mean when they say “frangipane” in everyday cooking. This recipe uses the almond cream. If you want the fuller, more custardy version, fold an equal weight of warm pastry cream into the almond cream once it’s smooth; it’s richer but adds a second component to make.

The surface should be uniformly golden brown across the whole top, including the almond cream between the pear halves — not pale in the center with browned edges, which signals underbaked frangipane. Press the center lightly and it should spring back with no jiggle; a toothpick slid into the cream between pears comes out clean. The glazed top has a faint, even sheen rather than a sticky gloss. Let it cool completely in the pan on a rack before unmolding: the almond cream needs the full cooling time to finish setting, and a warm tart will slump when you cut it. Served at room temperature the day it’s baked, or — better — the next day, once the flavors have deepened.

A single slice at the original Paris pâtisserie runs €6 to €9, and an American fine-dining restaurant will charge $60 or more for a whole tart when one is on the fall menu. Made at home, the entire tart — a stick and a half of butter, four pears, a cup of almond flour, a few pantry staples — costs roughly $10 to $14 depending on almond flour prices, and feeds eight. The only specialty item is a 9-inch tart pan with a removable bottom, a one-time purchase under $15 that you’ll reuse for every tart you ever make.