In a large bowl, toss brussels sprouts, onion, and shrimp.
In a separate bowl, whisk eggs, salt, sesame oil, and tamari. Add flour and stir until no lumps remain.
Pour egg mixture over brussels sprouts and mix well.
Heat 1 tsp oil in a small nonstick frying pan. When hot, dump ½ of the okonomiyaki mix into the pan and press flat. It will be about ½ - ¾ of an inch thick. Cook for 3-4 minutes, then flip and cook another 2-3 minutes. Repeat with the remaining mix.
While the pancakes cook, make the sauce by whisking together all ingredients.
Serve pancakes with a drizzle of sauce and toasted sesame seeds.
Recipe by Veggie Ninjas at https://www.veggieninjas.com/brussels-sprouts-okonomiyaki/