Joined twin cucumbers occur when a female flower's ovary splits and both halves are pollinated. They're edible and not extremely rare, just uncommon.

Why Cucumbers Taste Bitter and How to Prevent It
Growing Mango from Seed: Indoor Care
Loquat Fruiting in Atlanta: Rare but Possible
Elaeagnus: The Fragrant but Invasive Silverthorn
Pollinating Eggplants: Tap Flowers and Hum Engelbert Humperdinck
Creeping Cucumber (Melothria pendula): Invasive Vine with Tiny Watermelon Fruit
Why Limes Are Seedless: Parthenocarpy in Citrus and Other Fruits
Persistent Fruit Flies in Kitchen: Find the Breeding Source, Not Just Traps
Growing Tropical Fruit Trees from Seed in Canada – Challenges
Fungus Gnats & Fruit Flies in Orchid Collection: Source & Solution
Zucchini Fruit Rot: Water Management
Distinguishing Common Bermudagrass from Hybrid Varieties
Why Coconut Palms Won't Survive in Georgia (But Bananas Might)
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