In a bowl, whisk together the white miso paste, mirin, sake, soy sauce, sugar, and avocado oil until smooth.
Cover the salmon in the marinade and let marinate in the fridge for at least an hour.
Bake the salmon at 400F for 15-20 minutes or until the salmon hits 145F and the glaze is caramelized. For further caramelization, place under the broiler for 2-3 minutes at the end of baking.
Notes
Use Good Salmon - Fresh, high quality salmon is key here - the salmon is the star of this dish, so it's important that you use the best quality you can find. Look for a nice, deep pink color; you want to avoid anything that looks too pale or orange. Try to go for fresh salmon - this will be better quality than farmed fish.White vs Red Miso Paste - There are different types of miso paste, the most common being white (shiro), red (aka), and brown (genmai). White miso is milder and sweeter, red miso is stronger and saltier, while brown miso falls in between. I am opting for the white miso paste for this recipe, which will give the salmon a mild and sweet taste. You can use red miso paste, if you prefer.Optional: Broil Your Salmon - If you like extra caramelization, you can broil your Miso Glazed Salmon at the end of the baking process for 2-3 minutes. Keep an eye on it during this time, as you don't want to burn your fish!Storage - You can store this in an airtight container in the refrigerator for 3 days. Reheat in the microwave. I find that salmon has a tendency to fall apart a little when reheating due to the flake nature of the fish - this is normal but something to keep in mind.