adrian_turtle bought some Elstar apples at the farmers' market on Wednesday, and I got to taste one yesterday. Ie was sweet, crisp, and a little tart. It's a good early-season apple (much like the zestar I tried almost exactly a year ago) The Orange Pippin fruit website
describes it as "one of the best Golden Delicious offspring"; I wouldn't have guessed that ancestry from Elstar's flavor, texture, or appearance. It doesn't appear to be related to zestar*, despite both being good early-season apples and having similar names and appearances (the peel is a mix of pale red and green).
*except in the sense that any two domestic apple cultivars are more closely related to each other than either is to a pear, or a poodle