Reserve 1 can of cherries for the garnish. Drain the rest and reserve the syrup.
Purée the cherries in a food processor until fine, about 30 seconds. Remove to a bowl.
Add 1¼ cups of the reserved cherry syrup, the orange zest, lemon juice, Grand Marnier, and salt. Whisk in ¼ cup crème fraîche; save the remaining crème fraîche for garnish. Chill until