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I would like to point out that whilst I am not familiar with the berry and ginseng, the bittermelone or karela is not rare, as a matter of fact it is stocked frozen at Morrisons 300gms costs £1.10, and it is also a popular seasonal vegetable that my family buys regularly from any good high street Asian market/shop.
If you're not used to it, the preparation can seem a bit labour intensive. But once easily mastered, it is very delicious with the slightest of bitter taste for a hearty vegetarian dish. Treated similarly to other vine vegetables such as fresh runner green beans and or flat broad beans. Cooked in rich aromatic spices and herbs such as thyme and basil in a tomato base or a curry base. There are lots of instructions and recipes online.