Unsalted Butter (Best Option)
1:1 by volume (e.g., 1 tablespoon butter per 1 tablespoon coconut oil)Butter is a solid fat at room temperature with a melting point close to coconut oil, which helps create a smooth and creamy mashed potato topping. Its milk fat content enhances flavor and mouthfeel, complementing the savory filling.
For best results, use unsalted butter to control seasoning and melt it gently into the potatoes to avoid separation. Be mindful of the slightly lower melting point compared to coconut oil, which may affect the final texture if overheated.
Compared to coconut oil, butter adds a dairy richness that enriches the dish's flavor profile, making the Shepherd's Pie taste more traditional and indulgent.