Blood orange sparkling water, three ways
The unsweetened infusion, the syrup, and the ratio that makes the finished drink.
In season: December to April. Moro arrives first and runs darkest, Tarocco lands in February and is the sweetest, Sanguinello finishes the season. Outside that window you are paying a premium for an orange orange.
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Infused, unsweetened
Use
Segments of 2 blood oranges, supremed, plus peel from a third, per 1 litre
Method
Supreme the fruit over the jar so the juice lands with the segments. Peel the third one in strips and scrape the white off. Cold still water, refrigerate, and pull the peel at 3 hours.
Time
4 hours for colour, 8 for flavour. The colour arrives well before the taste does, which fools people into straining early.
Sparkling
Still water for the steep, sparkling in the glass. There is a second reason beyond fizz here: a pre-mixed bottle separates into a pale top and a red bottom within an hour, and a glass poured fresh over ice does not.
Keeps
2 days refrigerated. The colour visibly fades on day two, going from red toward brick.
The syrup
Ratio
1 cup sugar : 1/2 cup water : peel from 2 blood oranges : 1 cup fresh blood orange juice
Method
Dissolve the sugar in the water over low heat. Off the heat, add the peel and steep 20 minutes. Strain, cool the base all the way to room temperature, then stir in the juice. The juice must never be heated.
Keeps
10 days refrigerated, 4 months frozen. Freezing holds the colour better than the fridge does.
Note
The red is anthocyanin and heat destroys it. A blood orange syrup simmered with the juice in the pan comes out the colour of gravy. Cool the sugar base first, every single time.
The finished soda
1 part syrup to 4 parts sparkling water over ice
Acid deepens the colour. A squeeze of lemon drops the pH and the glass goes visibly redder while you watch.
The shrub version
1 cup blood orange segments with 1 cup sugar, 24 hours cold, strained, then 3/4 cup white wine vinegar. Rest 1 week. The vinegar acid holds the red far better than a plain syrup does, and this one stays vivid for months.
What doesn't work: Cooking the juice, which is the entire failure mode for this fruit. Anthocyanin pigments break down above roughly 160F and the batch goes muddy brown, which is why so many homemade blood orange syrups end up looking like weak cola. The other one is buying them in July, when southern hemisphere fruit arrives pale and you pay four dollars each for something that tastes like a navel.
Goes with: RosemaryThymePomegranateCranberryGinger