Kewpie is a rich Japanese mayonnaise made with egg yolks instead of whole eggs. The recipe varies, depending on whether it’s made in Japan or USA, with the American version adding sugar. Jumbo lump crab meat is a higher grade of crab meat than lump crab. It’s made up of the large intact chunks of meat that connect to the swimmer fins. The meat of jumbo is sweeter, and the texture is finer, than the lower grades. Use jumbo lump when appearance is important and flavor is tantamount, such as in this salad. Regular lump crab meat is made up of a mix of the broken up pieces of jumbo lump as well as large chunks coming from the body.