Amuse Bouche: Asparagus Mousse in a Sake Cup
1/2 lb asparagus, trimmed
2 green onions roughly chopped
1.5 tbsp Mayonnaise
3/4 tsp fresh lemon juice
large pinch cayenne pepper
1/2 tsp kosher salt, divided
2 tbsp heavy cream
1/2 egg white
12 sake cups (or Chinese spoons)
12 small oregano leaves

Boil salted asparagus in water until tender. Drain.
Place asparagus and onion in a food processor [...]