Lemon Butter Frosting with Yuzu & Almond Milk

Whisk the yolk and citrus together—don’t go overboard or it foams up weird. That’s the only part that matters right now. Everything else is just butter and sugar after the paste cools down. Takes 24 minutes total if you move fast, maybe 30 if you’re still figuring it out.

Why You’ll Love This Lemon Butter Frosting

Comes together in under half an hour. Not complicated. Just a bowl, a pan, a mixer. Tastes bright without being sharp—yuzu softens it, lemon zest adds that thing at the end. Almond milk instead of water means it doesn’t break as easy. Works cold or room temp. Thick enough to actually hold a shape on a cake. Doesn’t slide off like some frostings do. One bowl cleanup most of the time.

What You Need for Easy Lemon Butter Frosting

Yuzu juice. 100 ml. Sounds fancy—it’s not. Just citrus. Lemon would work but yuzu’s less aggressive.

Almond milk. Unsweetened. 150 ml. Changes the texture somehow. Creamier than water. Regular milk works but tastes different.

One egg yolk. Room temp if you can. Cold works, takes longer to emulsify.

Unsalted butter. 320 ml. Softened means soft—like it’s been sitting out. Not melted. Not cold from the fridge.

Granulated sugar. 220 ml. White sugar. Brown sugar changes the taste. Don’t bother.

All purpose flour. 60 ml. The roux component. Regular flour, nothing fancy.

Lemon zest. One tablespoon, finely grated. The whole point at the end. Not juice—zest. The skin part.

How to Make Lemon Butter Frosting

Start with the wet stuff. Yuzu juice, almond milk, egg yolk in a bowl. Whisk it together but not forever. Thirty seconds, maybe a minute. You want it combined, not foamy.

Now the roux. Put 40 ml butter in a saucepan over medium-low heat. Let it melt. Add all the flour at once. Stir constantly. This is the part where you actually have to pay attention. One minute, maybe a bit more. You’re waiting for the raw flour smell to go away. The mixture should be pale and smooth. If it starts browning, pull it off heat immediately. Doesn’t recover from that.

Pour the wet stuff into the paste slowly while whisking hard. It’ll look lumpy and glossy at first—that’s correct. Turn the heat up to medium-high. Bring it to a gentle boil. Not a rolling boil. Gentle. Stir continuously. Three minutes or so. You’re watching for the mixture to thicken, to coat the back of a spoon. It should feel less watery. Still pourable but heavier.

How to Get Citrus Frosting Creamy and Perfect

Pull it off heat. Pour it into a bowl. This part is crucial—cover it with plastic wrap touching the surface directly. No air gap. That prevents a skin from forming. Let it cool to room temperature. Not cold. Not warm. Room temp. The texture gets slightly gelatinous. Feels different than it did hot. This is on purpose. If you skip this, the eggs scramble when the mixer hits them.

Once it’s cool, add the remaining butter—280 ml—and the sugar. Use an electric mixer on medium-high. Beat for about six minutes. You’re watching the color go from yellow-ish to pale. Watching it get fluffy. Lighter. It should hold a shape but still be soft enough to spread. More beating means more air. More air means lighter frosting. Less dense.

Fold in the lemon zest at the end. One tablespoon finely grated. It adds texture. Gives aroma. Taste it now. Does it taste bright or does it need more tang? Fix it here.

Lemon Butter Frosting Tips and Common Mistakes

Curdling happens. Usually because the cooled paste was too cold or the mixer speed was too high. Fix it by warming the frosting gently over a double boiler—don’t let it get hot, just warm—then re-beat it. Works usually.

Texture’s too dense? You didn’t beat it long enough. Beat longer. Another two minutes. It’ll lighten.

Using it immediately? Let it sit at room temperature for a few minutes before spreading. Cold frosting doesn’t spread smooth. It tears the cake.

Storing it. Refrigerate in an airtight container. Lasts about a week. When you need it, let it come back to room temp and give it a quick whip with a fork or mixer. Five seconds. Just to loosen it back up.

Don’t put this on a cake and bake it. The frosting breaks in heat. Frost the cake after it’s baked and cooled. If you need it firm for stacking, refrigerate the frosted cake for an hour first.

Almond milk versus regular milk—almond milk is less likely to break. It’s got fat content that helps. Regular milk works but the frosting’s slightly more delicate.

Lemon Butter Frosting with Yuzu & Almond Milk

By Emma

Prep:

18 min

Cook:

6 min

Total:

24 min

Servings:

1 liter

Ingredients

• 100 ml yuzu juice
• 150 ml unsweetened almond milk
• 1 egg yolk
• 320 ml unsalted butter, softened
• 60 ml all purpose flour
• 220 ml granulated sugar
• 1 tablespoon finely grated lemon zest

Method

1. Step 1
2. 1 Mix yuzu juice, almond milk, and egg yolk in a bowl. Whisk until just combined. Avoid over-whisking or yolk may foam unpredictably.
3. Step 2
4. 2 In a heavy saucepan, melt 40 ml butter over medium-low. Add flour all at once; stir continuously. Cook about 1 minute until raw flour smell evaporates and mixture forms smooth blond paste. Be vigilant: browning? Scrap pan off heat promptly.
5. Step 3
6. 3 Slowly pour citrus mixture into paste while whisking vigorously. The immediate glossy lumpy texture signals starch hydration starting. Adjust heat to medium-high and bring to gentle boil. Watch closely – bubbles spread through mixture like fine sand. Stir continuously; simmer roughly 3 minutes until thickened, coating back of spoon.
7. Step 4
8. 4 Transfer to bowl. Cover directly with cling wrap touching surface to prevent skin forming. Cool to room temperature. The frosting should feel cool, slightly gelatinous. This step crucial to avoid scrambled eggs later.
9. Step 5
10. 5 Add remaining butter and sugar to cooled mix. Using electric mixer, beat for about 6 minutes on medium-high speed. You want pale, airy, fluffy texture that holds shape but still soft. Longer beating incorporates air; texture lightens.
11. Step 6
12. 6 Fold in lemon zest. Gives slight texture contrast and bright aroma. Taste here; tanginess should feel balanced with buttery sweetness.
13. Step 7
14. 7 Keep refrigerated if not using immediately. Let come close to room temp and give quick whip before spreading. To fix any curdling, warm gently over double boiler and re-beat.
15. Step 8
16. 8 Use on vanilla cake base, sponge, or almond pound cake. Works best spread thickly to contrast tang and sweet. Avoid direct oven heat once frosted unless firm chilling first.

Nutritional information

Calories

420

Protein

2g

Carbs

15g

Fat

35g

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Frequently Asked Questions About Lemon Butter Frosting

Can I make this without almond milk? Yes. Water works. Milk works. Almond milk just tastes better and the texture’s smoother. Water gets you there but it’s thinner.

What if I don’t have yuzu juice? Use lemon juice. More of it—maybe 120 ml. It’ll be sharper. Add a pinch of sugar to balance it.

How long does this frosting last? Five to seven days refrigerated in a container. Room temp it gets soft fast—use it same day if you can.

Can I freeze it? Yeah. Freezes fine. Thaw it in the fridge overnight. Beat it again before using. Texture comes back.

Why did mine split or curdle? The cooled paste was too cold when you added the butter. Let it sit longer. Or the mixer speed was too high. Medium-high beats faster than you think. Slow it down next time.

Does this work on chocolate cake? It works but the citrus fights with chocolate. Works better on vanilla, almond cake, sponge. Anything light.