Whisk lemon juice, soy sauce, sesame oil, cayenne pepper, and garlic in a large bowl. Add peppers, cilantro, and shrimp, toss to coat.
*Shrimp Brine: 2 quarts water, ½ cup kosher salt, 1/2 cup sugar, 1/4 cup Kikkoman Less Sodium Soy Sauce.
Combine all ingredients in a large bowl, stirring to dissolve salt and sugar. Submerge 2 pounds of peeled and deveined shrimp in the brine. Brine for 1 hour. Rinse shrimp and roast shrimp until done.