01 - Heat heavy cream in a small saucepan over low heat until just simmering. Remove from heat, add chopped chocolate, and let sit for 2 minutes. Stir until smooth, then blend in vanilla extract. Let cool slightly.
02 - Segment oranges over a bowl to catch juices. Combine orange segments, zest, lemon juice, and honey in the bowl. Set aside.
03 - If desired, toss mixed berries with sugar. Set aside.
04 - Layer chocolate ganache, citrus mixture, and berries in four dessert glasses. Repeat layers if glasses are tall.
05 - Top each serving with cocoa nibs or grated chocolate and a fresh mint sprig. Serve immediately or chill up to 2 hours.