Shake, strain, up.
Vodka infusion: 1 gram each of whole cardamom and dried mace flowers per 2 oz vodka. Quick-infuse in an iSi or other cream whipper: charge with N2O, shake for 30 seconds, let rest for 30 seconds, release gas & strain.
Recently purchased both a cream whipper and dried mace flowers. This is the result.