Feel like your Boston sour needs an update? Try this version from Ippudo – it's brimming with punchy flavour, and has a cheeky touch of umami from the bitters. Just don't drink it all in one go. Read the recipe below.
- 50ml Hakushu Japanese whisky
- 1 tsp lemon juice
- 1 dash Angostura bitters
- 1 egg white
To make it, shake all the ingredients together with ice and strain them into a martini glass.