For the steamed Calrose rice: In a saucepan on high heat, add the rice, salt and 2 1/2 cups water. Bring to a full boil, cover, place a tight-fitting lid on top and then reduce the heat to a simmer. Allow to cook for 18 minutes, then carefully fluff the rice with a fork before serving.
For the teppanysaki-style shrimp: Peel and devein the shrimp and remove the tails. Split the shrimp lengthwise.
Heat a large griddle or heavy wok over medium-high heat. Add the grapeseed oil and sesame oil. Add the shrimp and quickly sear to caramelize them, cooking them halfway, about 1 minute. Remove immediately.
Quickly add the ginger, garlic and onion and saute until tender, about 3 minutes. Add the carrots, baby corn if using and peppers and saute until cooked through, about 3 minutes. Crack the egg over the vegetables and quickly stir-fry to cook the egg.
Add the tamari, mirin, rice wine vinegar, sambal and dry mustard dissolved in water and toss until everything is well coated. Add the shrimp and mung bean sprouts and cook until the liquid is reduced by half and the shrimp are cooked through, about 1 minute.
Serve over the steamed rice and top with a squeeze of lemon juice, sliced green onions and sesame seeds