Ingredient

Grapefruit

Grapefruit is the only common breakfast fruit that is genuinely bitter, and the bitterness is not a fault to be sugared over. It comes from naringin in the pith and membranes, and how much of it reaches you depends almost entirely on how the fruit is prepared.

Bitterness is a preparation decision

Naringin, the compound responsible, is concentrated in the pith, the segment membranes and the peel rather than in the flesh itself. A grapefruit halved and eaten with a spoon delivers a good deal of it, because the spoon scrapes membrane along with juice.

The same fruit segmented properly — peel, pith and membrane all cut away — is markedly sweeter and cleaner, and people who believe they dislike grapefruit often turn out to dislike the membranes.

Ripeness matters too: naringin falls as the fruit matures, so late-season fruit is milder. And varieties differ substantially.

White, pink and ruby

White (Marsh)

Pale yellow flesh, the most acidic and the most bitter. The traditional breakfast grapefruit.

Pink

Milder and sweeter, with a little lycopene giving the colour.

Ruby / Star Ruby

Deep red flesh, the sweetest and least bitter of the three. If you are unsure, start here.

Pomelo

The grapefruit's much larger ancestor. Very thick pith, drier segments that separate cleanly, and far less bitterness.

Medication

Grapefruit interacts with a number of prescription medicines. That is a medical matter — follow the advice on your prescription or ask a pharmacist.

Segmenting one properly

The single technique that changes how the fruit tastes.

1. Slice off the top and bottom so it stands flat.
2. Cut down the sides following the curve, taking off peel, pith and the outer membrane in strips. Do not be timid — you want no white left.
3. Hold the peeled fruit over a bowl.
4. Cut in towards the centre alongside each membrane wall. The segment falls out clean.
5. Squeeze the remaining membranes hard over the bowl. That juice is the sweetest part.
6. Discard the membrane frame. It is where the bitterness was.

What to do with it

• Segmented, with a pinch of flaky salt. Salt suppresses bitterness more effectively than sugar and does not make the fruit cloying.
• Grilled or brûléed halves, with demerara sugar under a hot grill until it caramelises.
• In a salad with avocado, chicory, fennel or crab. The bitterness is an asset against fat.
• With prawns or white fish, where the acidity and bitterness cut richness.
• Grapefruit marmalade, which is excellent and less familiar than orange.
• The zest, which is aromatic and useful in a cake or a cure for fish.
• In a dressing, with the juice replacing some of the vinegar.

One thing worth knowing before you eat it

Grapefruit and grapefruit juice are known to interact with a number of prescription medicines. It is a real interaction rather than a folk belief, it applies to the juice as well as the fruit, and it is not something a small quantity necessarily avoids.

FoodHQ does not publish which medicines, what quantities, or what to do about it. That is medical guidance and it belongs to the people qualified to give it: the patient information leaflet that came with the medicine, a pharmacist, or the prescribing doctor. In the UK the NHS publishes guidance on it as well.

If you take prescription medication and eat grapefruit, or want to, ask a pharmacist. It is a thirty-second question and they will know.

Common questions