A May Day combines gin, bitter citrus apéritif (I used Campari), lemon juice, simple syrup, rhubarb bitters and sparkling white wine with a lemon twist. I got my recipe from Cocktail Party. I assume the name of the drink is a play on the surname of the inventor, bartender Jane Danger.
The flavor is bright. The rhubarb comes through with a tangy sour. The Campari brings the pink color and a bitter finish.