Coconut Oil (Best Option)
1:1 (1 tablespoon coconut oil per 1 tablespoon butter)Coconut oil is high in saturated fats similar to butter, which solidify at cooler temperatures, providing structure and creaminess essential for mousse. It emulsifies well with chocolate and cream, maintaining the mousse's smooth texture.
For best results, melt the coconut oil gently before mixing and allow the mousse to chill adequately to let it set. Using refined coconut oil avoids imparting coconut flavor, preserving the chocolate's purity.
Compared to butter, coconut oil can slightly alter the flavor profile if unrefined but generally maintains the mousse's richness and texture, making it the closest match.