French Blonde riff

2oz grapefruit juice, 2oz Choya Umeshu, 1oz gin, 1/2oz elderflower liqueur, 2 dashes orange bitters, 2 dashes lemon bitters. Shake until cold, strain over fresh ice, top with seltzer. Enjoy!

Personally, I think the Umeshu works better with these ingredients than Lillet blanc - though I love the original too.