Sweet Pea Toasts w/Slow-Cooked Salmon + Radish Salad

• 4 salmon fillets (6-oz | 170-g each)
• Salt and freshly ground black pepper

Heat the oven to 300°F (150°C). Season the salmon liberally with salt and pepper and bake until medium-rare, 15 to 20 minutes. Combine the radishes, arugula, olive oil, a big pinch of salt, and several grinds of black pepper. Ser