A couple of points. If you are trying to find Gravestones and/or burials do try "cemeteryscribes". It is a most useful site.
My family were fruiterers throughout the 18th and 19th and much of the 20th centuries. I have never seen any suggestion that fruiterers were also confectioners and I very much doubt that was the case.
People missing between censuses may often be nothing more than death intervening.
In the 1820s your family would have belonged to either the Great Synagogue in Duke's Place or the Hambro Synagogue or the New Synagogue. They were all within the neighbourhood of Spitalfields and what was known for many years as the Dutch Tenterground. As its name suggests it was the area to which many poor Dutch Jews came when they first arrived in London.
London, NW3 7TH