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Peak-season peaches sink into bubbling brown sugar caramel while nutty brown butter perfumes a tender, golden crumb. This is summer captured in a cast iron skillet, worthy of every church potluck and backyard gathering from Georgia to California.
The upside-down cake is American ingenuity at its finest. Cooks in the early twentieth century, working with cast iron skillets and wood-burning stoves, discovered that fruit baked beneath batter emerged transformed: caramelized, glistening, gorgeous. The technique requires no special skills. Just confidence and good fruit.
I've made this cake with pineapple, as tradition demands, but peak-season peaches elevate it to something transcendent. When August arrives and farmers' market tables sag under the weight of freestone peaches, their perfume filling the air before you even reach the stand, that's when this cake demands to be made. The flesh softens in the caramel, concentrating sugars while holding just enough structure to slice cleanly.
Brown butter is the secret weapon here. Where regular melted butter provides richness, brown butter delivers depth. Those milk solids toast in the hot pan, releasing aromas of hazelnuts and toffee that weave through every bite of the finished cake. It takes an extra five minutes of attention. The payoff lasts long after the last crumb disappears.
Bring this to a potluck and watch what happens. People will ask for the recipe before they've finished their first slice. They'll wonder what makes it different from every other upside-down cake they've tasted. The answer is simple: you cared enough to brown the butter and find peaches worth eating.
Quantity
10 tablespoons
divided
Quantity
3/4 cup
packed
Quantity
3 large (about 1 1/2 pounds)
Quantity
1 1/2 cups
Quantity
1 1/2 teaspoons
Quantity
1/2 teaspoon
Quantity
1/4 teaspoon
freshly grated
Quantity
3/4 cup
Quantity
2 large
at room temperature
Quantity
1 teaspoon
Quantity
1/2 cup
at room temperature
| Ingredient | Quantity |
|---|---|
| unsalted butterdivided | 10 tablespoons |
| dark brown sugarpacked | 3/4 cup |
| ripe peaches | 3 large (about 1 1/2 pounds) |
| all-purpose flour | 1 1/2 cups |
| baking powder | 1 1/2 teaspoons |
| fine sea salt | 1/2 teaspoon |
| nutmegfreshly grated | 1/4 teaspoon |
| granulated sugar | 3/4 cup |
| eggsat room temperature | 2 large |
| pure vanilla extract | 1 teaspoon |
| buttermilkat room temperature | 1/2 cup |
Arrange your oven rack in the lower third of the oven and preheat to 350°F. This positioning ensures the bottom caramelizes properly while the top doesn't overbrown. A good oven thermometer is worth its weight in gold here.
Halve your peaches and remove the pits. Cut each half into 4 wedges, giving you 24 slices total. If your peaches are truly ripe (and they should be), the skin will be thin enough to leave on. It adds color and a slight textural interest. Underripe peaches with thick, bitter skins should be peeled.
Place 8 tablespoons of butter in a 10-inch cast iron skillet over medium heat. The butter will melt, then foam vigorously as the water cooks out. Watch carefully. Once the foam subsides, the milk solids will begin to toast. Swirl the pan gently. You'll see golden-brown specks forming at the bottom and smell something like toasting hazelnuts. This takes 4 to 6 minutes from solid butter to brown butter. The color should be deep amber, not tan and not black.
Immediately pour the brown butter into a heatproof measuring cup, scraping every last bit of those precious browned solids. Let it cool to room temperature while you proceed. This takes about 15 minutes. If you're impatient, set the measuring cup in a bowl of ice water and stir occasionally, but don't let it solidify.
Return the empty skillet to medium heat and add the remaining 2 tablespoons of butter. Once melted, sprinkle the brown sugar evenly across the bottom and cook, stirring occasionally, until the mixture bubbles and the sugar dissolves into the butter. This takes 2 to 3 minutes. The caramel should look glossy and unified, not grainy. Remove from heat.
Working quickly while the caramel is still warm, arrange the peach slices in concentric circles over the caramel, starting from the outside edge and working inward. Overlap them slightly like fallen dominoes. Press gently so they nestle into the caramel. This is the face of your cake. Take a moment to make it beautiful.
In a medium bowl, whisk together the flour, baking powder, salt, and nutmeg until uniformly combined. Set aside. The nutmeg is not negotiable. Its warm, slightly sweet spice bridges the peaches and brown butter. Freshly grated delivers ten times the potency of pre-ground.
In a large bowl, whisk the cooled brown butter with the granulated sugar until combined. The mixture will look slightly grainy. Add the eggs one at a time, beating well after each addition. Stir in the vanilla. The batter should now appear smooth and glossy, the color of caramel candy.
Add the flour mixture in three additions, alternating with the buttermilk in two additions, beginning and ending with flour. Stir gently after each addition, just until incorporated. Overmixing develops gluten, and gluten makes cake tough. You want a batter that's thick but pourable, falling off the spoon in heavy ribbons.
Pour the batter over the arranged peaches. Use an offset spatula or the back of a spoon to spread it evenly to the edges, being careful not to disturb your careful peach arrangement beneath. The batter should reach the sides of the skillet with no gaps.
Transfer the skillet to the lower third of the oven and bake for 45 to 50 minutes. The cake is done when the top is deeply golden, the edges have pulled slightly away from the sides, and a wooden skewer inserted into the center comes out clean. The caramel will be bubbling visibly around the edges. If the top browns too quickly, tent loosely with foil for the final 15 minutes.
Let the cake rest in the skillet for exactly 5 minutes. Not longer. The caramel needs time to stop bubbling but cannot be allowed to set, or the cake will stick permanently. Place a large serving plate over the skillet. Gripping plate and skillet handle firmly together (use oven mitts), flip decisively in one confident motion. Lift the skillet away. If any peach slices stick, retrieve them and press back into place. No one will know.
This cake wants to be served warm, when the caramel is still slightly fluid and the peaches glisten like jewels. A scoop of good vanilla ice cream is traditional and correct. Lightly sweetened whipped cream offers a lighter alternative. The cake will keep, covered, at room temperature for two days, but it's best within hours of baking.
1 serving (about 145g)
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