I make myself an almond+cashew milk latte every morning. The nut milk I use foams "okay" but not amazing. I know there's some barista blends out there, but they're harder to find and more expensive and mostly I just can't be bothered.
BUT! I have made a discovery which changes everything!
The other day, in my uncaffeinated haze, I accidentally pulled my espresso shots into the metal frothing jug. After noticing my error, I poured the shots into my mug where they belong and then I put the nut milk in the jug without rinsing out the espresso residue. The resulting nut milk with a hint of espresso in it foamed *great*. Total game changer.
Hopefully this helps some of my fellow lactose-avoidant fellow coffee drinkers out there.