Method
1
Chop the chocolate into small pieces and place in a heatproof bowl over simmering water, stirring occasionally until fully melted and smooth.
2
Remove the melted chocolate from heat and stir in the rum, then set aside to cool slightly for 2–3 minutes.
3
In a separate bowl, whisk together the whole egg and egg white until well combined.
4
Gradually add the sugar to the egg mixture while whisking continuously until light and pale, about 2–3 minutes.
5
Fold the cooled chocolate into the egg mixture gently with a spatula until just combined.
2 minutes
6
Fold the chopped walnuts into the chocolate mixture until evenly distributed throughout.
7
Line a baking sheet with parchment paper and drop small rounded spoonfuls of the mixture onto it, spacing them about 1 inch apart.
8
Refrigerate the formed pieces for 15–20 minutes until firm and set.
20 minutes
9
Transfer the minions to an airtight container for storage, or serve immediately at room temperature.