A Royal Union

1 oz Calvados
1 oz Amaro, Averna
½ oz Walnut liqueur, Nux Alpina
½ oz Amaro, Nonino
2 ds bitters, Bittermens Xocolatl Mole
Preserved crab apple garnish (optional)^†

Stir, strain, garnish.

^† original recipe does not call for a garnish, but we just picked up some lovely preserved crab apples from Karelia Kitchen and could not resist.