Add shallots into a small food processor, pulse until finely chopped.
Add shrimp, pulse 5-6 times.
Add remaining ingredients (except crab and green onion) and pulse a few times until evenly mixed.
Pour into a mixing bowl, add crab and lightly mix with a spoon.
Using a soup spoon, scoop 1-2 tbsp size balls (your choice!) into the pot until you use it all
Raise the heat to high and bring to a boil, then drop heat to a low boil. At most it should take 20 minutes to cook the meatballs all the way through. Check doneness by breaking a meatball in half to make sure its not soft or raw inside.
During the last five minutes of cooking, drop in the chopped green onion so it slightly softens