To make rhubarb juice, macerate rhubarb with sugar and strain juice from solid fruit.
Place all ingredients in a cocktail shaker filled with ice and stir (or shake if you desire). Pour contents of cocktail shaker in a glass filled with ice or a chilled martini glass. Garnish with orange twist or slice.
Recipe by Tout va bien! (tm) at https://christymajors.com/vegflavorbible-spring-negroni/