Combine fish, green onion, parsley, eggs, and bread crumbs in a large bowl; mix well. Scoop out large heaping tablespoons and form into balls. Place on a sheet pan about 1 inch apart. Use a plate or another sheet pan to slightly flatten into cakes. Heat cooking oil in pan on medium-high heat. Pan fry cakes until golden about 2 minutes a side.
- Boil one pot of water. In a separate sauce pan melt butter and whisk in flour at medium-high heat.
- Continue to cook flour and butter mixture until it lightly brown then slowly stir milk. Continue to stir as it thickens. Turn off heat and add cheese; let it melt.
- Add pasta and a big pinch of salt to pasta. Cook until desired done-ness.
- Mix elbow and cheese sauce. Add salt and pepper if desired. Gently fold in crab and shrimp into the mix and leave a few pieces to garnishes the top.
- Enjoy and Cheers!