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Rosemary and Citrus Cordial

A citrus cordial flavored with rosemary, ginger, and sugar.

From the Wikibooks Cookbook · 8 ingredients
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Why it works: Lemon and rosemary match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 845 recipes. Both carry beta-phellandrene, which smells minty, terpene. The science ↓

Rosemary and Citrus Cordial

yield 20
Time15 minutes

Ingredients

Directions

Prepare the flavourings

  1. Remove long strips of peel from grapefruit and two lemons using a peeler, avoiding the white pith.

  2. Put the peels into a saucepan. Juice the lemons and grapefruit, and add the juice to the pan.

  3. Roll rosemary sprigs over a rolling pin on a chopping board a few times to release the oils.

Make the syrup

  1. Add rosemary to the pan with ginger, sugar, and water.

  2. Heat for 5 minutes over low‑medium heat, stirring occasionally, to dissolve the sugar.

  3. Reduce heat to low and cook for 15 minutes until a slightly thick syrup forms. Leave to cool, then use immediately or chill overnight to develop the flavors.

Strain and serve

  1. Strain the cordial syrup through a sieve into a bowl or jug, then transfer to a bottle.

  2. To use, mix 1–2 tablespoons of cordial into ⅔ cup of fizzy water to make soda, or add to boiling water with 2 tablespoons whiskey to make a hot toddy.

Nutrition, whole recipe (rough)

119Calories
2 gProtein
0 gFat
31 gCarbs

Counts 5 of 7 ingredients. The other 2 aren't in our nutrition table and add nothing above, so the real totals are higher.

What these numbers assume: 5 portions
IngredientPortion assumedkcal
Grapefruit1/2 fruit (123g)52
Sugar1 tbsp (12.5g) granulated49
Lemonjuice of 1 lemon (48ml)12
Rosemary1 tsp dried (1.2g)4
Ginger1 tsp grated fresh (2g)2
Waternot in our table0
Whiskeynot in our table0

One typical portion per ingredient; the recipe's quantities are not counted. A rough guide only, not for medical or dietary planning.

Recipe from the Wikibooks Cookbook.

Steps grouped into stages for easier reading; the method is the source's own.

Explore the science

The flavor team

The pairs that carry this dish. Each one is judged two ways: how much their aromas overlap, and how often cooks already put them together.

  1. Lemon + rosemarytop 1% of all pairs
    Smell alikestrong
    Cooked together845 recipes

    Shared aroma: beta-phellandrene (minty, terpene).

  2. Grapefruit + lemontop 4% of all pairs
    Smell alikestrong
    Cooked together184 recipes

    Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).

  3. Lemon + gingertop 5% of all pairs
    Smell alikestrong
    Cooked together5,154 recipes

    Shared aroma: beta-phellandrene (minty, terpene).

  4. Rosemary + gingertop 5% of all pairs
    Smell alikestrong
    Cooked together113 recipes

    Shared aroma: 1-octen-3-one (mushroom, metallic).

  5. Grapefruit + gingertop 7% of all pairs
    Smell alikemoderate
    Cooked together38 recipes

    Shared aroma: decanal (soap, orange peel).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Superfine sugar
Dissolves into the water to form the syrup and provides sweetness that balances the citrus.
Lemons
Add acidity and bright citrus aroma, with juice and peel both contributing flavour.
Grapefruit
Adds bitter-tinged citrus flavour and acidity from its juice and peel.
Rosemary
Contributes aromatic herbal oils that flavour the syrup.
Ginger
Adds warm, spicy aroma that infuses into the syrup as it simmers.

The step that matters

Heating the sugar syrup gently. Over-high heat can scorch the sugar and turn the syrup bitter, while gentle heat dissolves the sugar fully and draws flavour from the peel and herbs without harshness.

Swap the grapefruit

How well each one fits the dish's main ingredients (lemon, rosemary, ginger, sugar):

  1. Orangefits better
  2. Limefits better
  3. Grapefruitthe original
  4. Cherryfits less well

Fit is the average pairing score against lemon, rosemary, ginger, sugar. Candidates are from the same food group and used in at least 100 recipes.

“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.

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