Preheat oven to 425°.
In a small sauce pan, add all the teriyaki sauce ingredients and whisk together over medium-high heat. Let boil for 2-3 minutes, whisking continuously. Reduce heat to low and continue to whisk every few minutes until sauce thickens.
Once the sauce coats the back of a spoon (and you can run your finger down the back of the spoon and leave a distinct line), your sauce is ready. Keep warm until ready to use.
For the yum-yum sauce, mix all ingredients together, except the water, in a small bowl. Add 1/2 tbsp of water at a time to get to your desired consistency. I like mine thicker but easy to drizzle. Set aside.
Cut salmon into cubes and season with salt and pepper.
Place onto a lightly greased baking sheet and cook in the oven for about 8-10 minutes, or until cooked through.
Remove salmon from oven and let cool slightly. Top with 2 tablespoons (or an amount that makes you happy!) of the teriyaki sauce and toss gently to coat the salmon.
Let's build your bowl! Place rice at the bottom of a bowl, top with salmon, and drizzle with extra teriyaki sauce, if desired. Add your sliced cucumbers, shredded carrots, and any other toppings you like. Drizzle yum-yum sauce over the bowl, top with sesame seeds and scallions, and enjoy!