Key Lime Doughnuts
Key Lime Doughnuts offer a tender, cake like crumb scented with bright lime zest and finished with a silky lime glaze. This quick baked treat is tangy, not overly sweet, and perfect for a sunny brunch or an easy weeknight dessert. Make them when you want something light, citrusy, and impressive with minimal fuss.
Equipment
- Doughnut pans
- Mixing Bowls
- Whisk
- Pastry bag or zip top bag
- Wire Rack
Ingredients
- 1 1/4 cup s (156 grams) unbleached cake flour Provide structure and a tender crumb by contributing protein and starch; sifted cake flour yields a delicate, light doughnut texture ideal for quick cakes and fried batters.
- 3/4 teaspoon (2.25 grams) kosher salt Season and enhance overall flavor balance by providing a clean saline note that strengthens gluten and elevates the sweetness and acidity so the doughnuts taste well-rounded.
- 1/2 teaspoon (2.5 grams) baking powder Leaven gently and help the doughnuts rise modestly by releasing carbon dioxide when heated, contributing to a light, airy interior without over-doming.
- 1/4 teaspoon (1.25 gram) baking soda React with acids in the batter to create immediate lift and fine crumb; baking soda also helps neutralize excess acidity from lime and buttermilk.
- 1/2 cup (100 grams) granulated sugar Sweeten the batter, tenderize by interfering with gluten development, and help with browning to achieve appealing color and pleasant caramel notes on the exterior.
- 2 tablespoon s (6 grams) lime zest Deliver bright citrus oils and intense lime aroma; finely grated zest imparts concentrated fresh lime flavor throughout the dough and glaze.
- 1/4 cup (60 grams) whole buttermilk, room temperature Add tang and moisture while reacting with baking soda for leavening; room-temperature buttermilk contributes acidity for tenderness and flavor depth.
- 1 large egg (50 grams), room temperature Bind ingredients, add moisture and richness, and provide emulsification for a cohesive batter while helping achieve a fine, even crumb.
- 5 tablespoon s (75 grams) fresh lime juice or key lime juice (see PRO TIP), divided Supply concentrated lime flavor and acidity; dividing the juice lets some go into the batter for taste and some into the glaze for bright finishing flavor.
- 3 tablespoon s (42 grams) vegetable oil Moisturize and tenderize the dough by coating flour proteins, yielding a softer texture and helping the doughnuts stay tender after baking or frying.
- 1 1/2 cup s (180 grams) confectioners’ sugar Sweeten and thicken glazes to create a smooth, opaque coating that sets on the doughnuts; confectioners’ sugar also helps capture lime juice for a glossy finish.
- Green and yellow liquid food coloring Color and visually enhance the glaze and final presentation; a few drops of food coloring tint the icing to match a vibrant key lime theme.
- Garnish: graham cracker crumbs, lime zest Add crunchy texture, complementary honeyed-citrus notes, and visual contrast; graham cracker crumbs and extra lime zest finish the doughnuts with brightness and crunch.
Instructions
- Preheat oven to 400°F (200°C). Butter and flour 2 (6-well) doughnut pans.: When you put the pans in, you should feel a mild warmth in the air of the kitchen as the oven approaches temperature, and the prepared wells should glint slightly from the butter. Getting the oven fully hot first ensures the batter puffs immediately when it hits heat, which sets the exterior and preserves a delicate interior. A common mistake is starting with a cool oven, which can cause uneven rise and a denser crumb.
- In a small bowl, whisk together flour, salt, baking powder, and baking soda.: As you whisk, the dry mixture should look uniform and pale, with no streaks of clumping. This step evens out leaveners so each doughnut rises the same way, and it prevents pockets of salty or soapy flavor. If you notice clumps, sift or push them through a fine mesh to avoid uneven texture later.
- In a medium bowl, whisk together granulated sugar and lime zest until zest is evenly distributed. Add buttermilk, egg, 3 tablespoons (45 grams) lime juice, and oil. Whisk until combined. Add flour mixture, and whisk until just combined, stopping to scrape sides of bowl. Transfer batter to a pastry bag, and cut a 1/2-inch opening in tip. Pipe batter evenly into prepared wells (about 2 heaping tablespoons or 35 grams each).: Right after mixing, the batter should smell bright with lime and look smooth and slightly glossy from the oil. The sugar blended with zest should have tiny flecks of green throughout, releasing fragrant oils. Folding the wet and dry just until combined prevents gluten overdevelopment, which keeps the texture tender. If you overmix, the batter will become elastic and the doughnuts can be tough, so stop when streaks disappear but a few small lumps remain.
- Bake until puffed and edges are golden, 8 to 10 minutes, rotating pans halfway through baking. Let cool in pans for 10 minutes. Invert doughnuts onto a wire rack, and let cool completely.: While baking you should see the tops rise and set, and the edges should pick up a light golden hue. The kitchen will fill with a bright citrus scent, and the centers should spring back when gently pressed. Letting them sit briefly in the pans allows the structure to stabilize so they unmold cleanly. A frequent error is removing them too soon from the pans, which can cause sagging or breakage when inverting.
- In a small bowl, whisk together confectioners’ sugar and remaining 2 tablespoons (30 grams) lime juice. Tint with food coloring as desired. Carefully dip top of each doughnut into glaze. Garnish with graham cracker crumbs and lime zest, if desired. Store in an airtight container for up to 3 days.: The glaze should be glossy and thick enough to cling, but fluid enough to coat the top smoothly; you will hear a faint, soft slapping as excess glaze drips back into the bowl. Dipping warms the surface and slightly softens the top, allowing the glaze to set with a thin shell. If the glaze is too runny, add a little more confectioners sugar to thicken; if too stiff, add a drop of lime juice. Be careful stacking glazed doughnuts before the glaze sets, or it will smear.
Notes
- Measure by weight: When you weigh your cake flour and sugars you reduce variability that comes from scooping, which keeps the crumb consistent every bake.
- Use bottled Key lime juice if you can: It concentrates the characteristic tart note of key limes and is far easier than extracting juice from tiny limes, while still delivering authentic flavor.
- Distribute zest into sugar: Rubbing the lime zest into the granulated sugar releases oils, dispersing aroma more evenly through the batter.
- Pipe for even portions: Using a pastry bag or a zip top bag with the corner snipped gives control, so each doughnut bakes at the same rate and finishes uniformly.
- Adjust glaze thickness: If the glaze runs off, add more confectioners sugar; if it is clumpy, add a drop more lime juice to smooth it. Small adjustments make a significant difference.