Use this compote to top our Breton Butter Cake.
Combine berries, Grand Marnier, and zest in a small bowl. Toss; let stand 30 minutes.
Bring juice to a boil in a small saucepan over medium heat; reduce heat, and simmer until liquid is reduced to 1/4 cup, about 20 minutes. Remove from heat; let cool. Pour over strawberries, and toss to combine.