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Vibrant in both flavor and color, these blood orange brownies feature a layer of rich, fudgy chocolate brownie topped with a tart blood orange curd.

Chocolate and orange are a classic combination, but not one often seen in brownies (or if it is, flavored with little more than a bit of zest or orange extract). This lovely layered treat is as much about the citrus curd as it is about the brownie, resulting in a rush of flavor and luscious texture in each and every bite.

I first set out to make a lemon bar brownie, with a layer of tart lemon curd on top of a rich chocolate brownie. It was an unusual idea, for sure, but I was kind of excited about it, to be honest.

But Taylor has some sort of moral opposition to the combination of lemon and chocolate, why I cannot say, and managed to talk me into doing an orange version instead.

I actually made a half batch of each, one orange, one lemon, for research purposes, and brought both with me to ceramics class along with a paper to collect votes on which one everyone preferred. It was a close match, but ultimately the orange won by a single vote. And who am I to deny the people what they want?

My main challenge when testing this recipe is that orange curd, unlike lemon curd, has a tendency to be somewhat bland tasting (especially when you are comparing it bite for bite to lemon curd, which is why it surprised me that the orange version won, since it was my first batch and the orange was rather dull in comparison).

While the flavor of orange and chocolate go together beautifully, the lemon definitely had a noticeably brighter, punchier flavor. I wanted to see if I could replicate that tartness in the orange version.

I tested a few methods to try and create an orange curd that was equally punchy, including adding orange extract, lots of orange zest, lemon juice, and citric acid.

In the end, I reduced the orange juice to concentrate the flavor and added a tiny bit of citric acid to amp up the acidity and tartness. The result is a bold and bright orange flavor with a tart zing comparable to the lemon version (the best of both worlds, if you ask me!)

The Natural Color of Blood Oranges

When it comes to blood oranges, they can really vary quite a bit in their, er, bloodiness shall we say. Some will sport flesh the color of a rich, burgundy wine while others look a lot like regular navel oranges. And you can’t always tell the color of the inside by the color of the rind.

Depending on the intensity of your blood oranges, your curd layer may be anywhere from a deep plum to a lighter mauve or even a coral orange with just a hint of pink.

If wish I had taken pictures of my first two batches of this recipe, as you’d be shocked at how different they looked; it was pure luck that the oranges I juiced for the final batch had such a deep red color—darker even than the ones I cut open for the photo above (and you can see the variation pretty obviously between the two cut oranges in that image… if all of my oranges had been like the lighter one in the back right, the final brownies would’ve looked quite different indeed.)

When buying blood oranges, you want to choose oranges that feel heavy for their size (this means they’re nice and juicy). I usually try to get ones that have a noticeable blush on their skin, although that’s not always indicative of the inside color. You’ll need about 4-6 juicy oranges to yield a cup of freshly squeezed juice (this juice then gets simmered and reduced by half).

While the raspberry-like flavor of the blood oranges is a perfect compliment to the chocolate, you can also use other varieties of oranges here—I think the coral pink Cara Cara oranges would be particularly lovely.

Tip: When reducing the orange juice, dip a toothpick into the pan before you start cooking; the juice will stain the wood up to the original depth. Then as the juice reduces, you can use another toothpick to compare the depth and know when it is reduced by approximately half without having to pour it out to measure it.

The Secret is in the Citric Acid

While you can use plain lemon juice instead of the citric acid, trust me when I say you won’t regret making the extra effort to track it down. It gives the blood orange curd a sour candy-like tartness, and a bright and springy flavor that you really can’t replicate with just orange juice or even with orange and lemon juice.

In a sense, citric acid is to oranges almost like salt is to tomatoes or espresso is to chocolate, in that it makes the orange taste even more, well, orangey. It doesn’t have a flavor on its own, rather, the extra acid intensifies the natural flavor of the oranges.

I also have plans for another sweetly sour recipe swirling in my brain that uses citric acid, so you may as well just get some now and then you’ll be set (plus it like, never goes bad so one container will last you forever).

Other uses for citric acid include:

• canning and preserving (it can be used in place of lemon juice in most recipes to provide a more netural flavored acidity
• candy making (hello homemade sour patch kids!)
• food photography (mix with water and brush or spritz on apples or avocados to keep them from browning)
• cheese making (since it has a more consistent ph than lemon juice)
• Mix with salt and give your margarita rim an extra sour punch
• cleaning (there are lots of recipes out there for DIY cleaners)

Want to make a lemon version instead?

You wouldn’t think lemon and chocolate would go together, but the lemon version of this recipe is actually quite lovely, even if it was the orange that ultimately won out.

This recipe can easily be made with lemon instead of blood orange, simply use 1/2 cup of freshly squeezed Meyer lemon juice in the curd. Skip step #1 (no need to reduce the liquid since lemon juice is plenty potent as it is); you can also leave out the citric acid for the same reason.

Leftover Egg Whites?

No problem. I’ve got a whole page of egg white recipes, just for this reason!

Between the curd and brownie layers you’ll find yourself with 5 leftover egg whites. I’m not one to complain about such a hardship, however. Because, amaretti.

If you wanted you could also whip up a batch of meringue kisses like I did here, which would make a super cute topping for these bars (just don’t put the meringues on top until just before serving, otherwise they’ll soften and start to melt).

Tip: egg whites also freeze beautifully! Just pour into a (labeled and dated) zip-top freezer bag. If you can, lay it flat on a smooth surface in your freezer. Once frozen solid, you can stack the bags, making things extra neat and organized (like a little egg white library).