Place crab meat in a large bowl and use your fingers to gently feel for and remove any pieces of shell or cartilage. Add green onions, bread crumbs, seafood seasoning and pepper and toss to combine.
In a small bowl, whisk together mustard, eggs, mayonnaise and lemon zest, pour over the crab mixture. Toss until combined, cover and refrigerate 30 minutes.
Form the crab mixture into 24 small cakes, each about 1 1/2 inches in diameter. Heat oil in a large nonstick skillet over medium heat. Working in batches, fry cakes until nicely browned and cooked through, about 3 minutes per side. Drain briefly on a paper-towel lined plate and serve.
These freeze well also, freeze in a single layer on a sheet pan and when frozen toss into a freezer bag.