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The cake makes 1 standard loaf. To make a bundt or tube cake, you’ll want to double the recipe (it will take anywhere from 45 to 60 minutes, as shapes range a lot). For the doughnut or bundt cake, I double the glaze. For the raspberries, fork-mashing is easier, but if you’re bothered by seeds or want the smooth appearance you see in the top photo, you’ll want to blend the berries and sieve out the seeds.
- Butter or cooking spray to coat pan
- 1 cup (200 grams) granulated sugar
- 1/4 teaspoon fine sea or table salt
- Finely grated zest from half a lemon
- 1/2 cup (115 grams) unsalted butter
- 2 large eggs
- 2 teaspoons baking powder
- 1 cup (130 grams) all-purpose flour plus 1/2 cup (65 grams) all-purpose flour, divided
- 1/2 cup (125 grams) sour cream, creme fraiche, or full-fat plain yogurt
- 1 gently heaped cup (140 grams or 5 ounces) fresh raspberries
- 3/4 cup (90 grams) powdered sugar
- 1 tablespoon raspberry puree (for a pink glaze, from a few tablespoons or 1 ounce fresh raspberries), or lemon juice
- 1 to 2 tablespoons milk
Place raspberries in the bottom of a second medium-large bowl and mash with a fork until mostly broken down but still a little lumpy; you’ll have about 1/2 cup mashed. [If you really dislike raspberry seeds and/or want a smoother look, you can blend the berries until smooth and press them through a fine-mesh strainer — into this second bowl — to remove seeds.]
Pour half of the cake batter on top of raspberries (if you have a scale, you can zero out the weight of the bowl and raspberries; half the batter weights 277 grams) but wait, don’t mix it yet.
Beat the raspberries and second half of the cake batter together until smooth. Add final 1/4 cup flour, and beat just until smooth.
Dollop batters in alternating spoonfuls into bottom of prepared loaf pan. Roughly “checkerboard” the rest in, meaning that you’ll drop a pink batter dollop and then a white one and vice-versa until both batters are used up. Drop your pan onto the counter a couple times from a few inches high, to help tap out air bubbles. Use a butter knife or small offset spatula to make a few figure-8s through the batters, marbling them together — but just a little, say, 4 to 5 figure-8s. Any more and the swirls may not look distinct when you cut the cake.
Bake loaf cake for 50 to 55 minutes, or until a toothpick inserted into the center of the cake comes out batter-free. Let cool for 15 minutes in pan, then run a knife around cake and gently remove. Let cake cool completely on rack (I hasten this along in the freezer) before glazing, if using a glaze.

