01 - In a medium saucepan, bring the dashi stock to a gentle simmer over medium heat.
02 - Place the miso paste in a small bowl. Add a ladleful of hot dashi to the miso and whisk until smooth, then return this mixture to the saucepan. Stir gently, keeping the soup below boiling to preserve the miso's flavor and nutrients.
03 - Add the tofu cubes and dried wakame seaweed to the soup. Simmer gently for 2–3 minutes until the seaweed rehydrates and the tofu is warmed through.
04 - Remove from heat. Ladle the soup into bowls and garnish with sliced green onions. Serve immediately.