Synsepalum dulcificum, also known as the miracle fruit, is a plant with a berry that, when eaten, causes sour foods (such as lemons and limes) subsequently consumed to taste sweet. This effect is due to miraculin, which is used commercially as a sugar substitute. The berry itself has a low sugar content and a mildly sweet tang.
The fruit is a round to oval drupe 3–6 cm (rarely to 8 cm) tall and 3–4 cm broad, borne in a loose pendant cluster of 10–20 together. The leathery skin is reddish (rarely orange or yellow), and covered with fleshy pliable spines, hence the name rambutan, derived from the Malay word rambut, which means hairs. The fruit flesh is translucent, whitish or very pale pink, with a sweet, mildly acidic flavor very reminiscent of grapes. The single seed is glossy brown, 1–1.3 cm, with a white basal scar.
Soft and crunchy, the seeds may be cooked and eaten. Some folklore regards the seeds as poisonous, but tests of seed extracts reveal no toxicity to mice, even in doses up to 2500 mg/kg. The extract does show some analgesic activity, however. The peeled fruits can be cooked and eaten, first the grape- aril, then the nutty seed, with no waste.
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