Prepare the Salmon: Rinse the salmon bellies under cold water and pat dry. Remove scales or bones. Score the skin slightly if desired.
Marinate: Combine soy sauce, minced garlic, brown sugar, and mirin in a bowl. Coat the salmon evenly and marinate for at least 30 minutes.
Pan-Sear the Salmon: Heat oil in a non-stick pan over medium-high heat. Place salmon skin side down first, cooking for 3-4 minutes per side until the skin is crispy and the flesh is just cooked through.
Prepare the Sides: While the salmon is cooking, steam or prepare your choice of vegetables or salad.
Plate Your Dish: Serve the crispy-skinned salmon on a bed of your prepared sides. Garnish with fresh herbs or a sprinkle of citrus zest.