The crab isn't even the rarest ingredient — the green Kampot peppercorns tossed in whole are picked unripe and fresh, a form of the spice that barely survives shipping and so is mostly only eaten right where it's grown.
Whole crab, usually caught that morning at Kep, is stir-fried hard in a wok with garlic, spring onion, palm sugar, fish sauce, and a heavy handful of fresh green Kampot peppercorns still on the stem. Stalls at Kep's covered crab market sell it fresh off the wok, shells cracked open at the table.