The success or failure of this tangy drink is partly reliant on the quality of marmalade used. For ease of use, choose "fine cut" or even "no peel"/"shredless"...
First cocktail out of edition 17 book. Had them many times before in restaurants, first time made at home. Garnish on the side and the marmalade used was Fortnum & Mason No 62 Orange and Champagne marmalade and on a Peters yard sourdough original cracker as the garnish was superb. Lovely little brunch martini.