__ and Jelly, Cockney Rhyming Slang for Telly

Word Meaning:

CUSTARD — A type of sauce made from milk and eggs (and usually sugar, and sometimes vanilla or other flavourings) and thickened by heat, served hot poured over desserts, as a filling for some pies and cakes, or cold and solidified; also used as a base for some savoury dishes, such as quiches, or eaten as a stand-alone dessert; egg custard.

Definitions from Wiktionary.