Rhubarb & Pistachio Brown Butter Financier

Instructions

1. 1

   Preheat oven to 375°F (190°C). Grease an 8-inch round cake pan or cast-iron skillet with 1 tsp softened butter and line the bottom with parchment paper. You want a pan that conducts heat well to ensure that signature crisp edge.

   5 min

   Tip: Don't use a glass dish here; it won't give you the crust you need.

2. 2

   In a small saucepan over medium heat, melt and brown 150g unsalted cultured butter. Swirl the pan constantly. It will aggressively bubble, foam, and then suddenly smell intensely of toasted hazelnuts. Once you see golden-brown flecks at the bottom, pull it off the heat immediately.

   5 min

   Tip: Let your nose guide you. The transition from melted to browned happens in seconds.

3. 3

   While the butter browns, whisk the 100g ground pistachios, 150g granulated sugar, 50g all-purpose flour, 1 tsp flaky sea salt, and 1 tbsp orange zest in your one large mixing bowl. Break up any stubborn pistachio clumps with your fingers.

   3 min

   Tip: Rubbing the orange zest into the sugar first releases the essential oils, amplifying the citrus note.

4. 4

   Pour the hot browned butter—scraping every single toasted brown bit from the bottom of the pan—directly into the dry ingredients. Whisk until it forms a thick, fragrant paste.

   2 min

   Tip: The dry sugar and cold nuts instantly drop the temperature of the butter. This is the shortcut that lets us add eggs immediately.

5. 5

   Pour in the 4 large egg whites. Whisk vigorously for about 30 seconds until the batter transforms from a greasy paste to a smooth, glossy, and cohesive ribbon. No need to whip the whites to peaks; we just rely on their protein for structure.

   2 min

   Tip: Cami's shortcut note: We skip whipping the egg whites to keep this one-bowl. The texture will still be wonderfully chewy.

6. 6

   Fold in half of the 200g rhubarb. Scrape the batter into your prepared pan, smoothing the top. Scatter the remaining rhubarb evenly across the surface and sprinkle with the final 2 tbsp granulated sugar. Let the batter rest on the counter for exactly 10 minutes.

   12 min

   Tip: Don't skip this. The 10-minute counter rest hydrates the pistachio flour. Skip it, and your crumb goes tight like a bad alibi.

7. 7

   Bake for 30 to 35 minutes. You are looking for edges that are deeply browned and pulling away from the sides of the pan. The center should feel set with a very slight wobble when tapped.

   35 min

   Tip: Financiers should be heavily caramelized on the outside to contrast the lacy, chewy interior. Do not underbake the edges.