Marinated Salmon with Sweet Potatoes and Red Pepper Salsa

Name: Marinated Salmon with Sweet Potatoes and Red Pepper Salsa
Ingredients: 2 thumb-sized piece of ginger, peeled and finely grated; 1 lemon and 2 limes, zested; 1 bottle soy sauce; A dash mirin; 1 medium salmon fillet, about 2 1/2 pounds (1.1 kilograms), descaled and pinboned with the skin left on; 9 sweet potatoes, scrubbed and pierced; Sea salt; 1 red pepper, deseeded and finely chopped; 2 green chillies, deseeded and finely chopped; 1/2 a lemon and 1/2 a lime, juiced; Twice as much olive oil to the juices; 1 small bunch fresh mint, chopped