Sweetcorn, chickpeas or maples may well be the going bait and it could then be an advantage to fish a couple of very large jumbo tiger nuts of half a brazil nut over the top of the baited area. BNC
Another help is selenium, a vital trace element: one brazil nut will provide your daily needs. BNC
But the Brazil nut is a seed with a thick wall, the walnut a drupe, a stony-seeded fruit. BNC