Steps
1. Prepare the potato by peeling and cutting it into bite-sized chunks.
2. Slice the bell pepper into thin strips and cut the tomato into wedges.
3. In a small pot, bring the dashi stock to a gentle simmer.
4. Add the potato chunks and cook for about 10 minutes until they start to soften.
5. Add the bell pepper slices and continue simmering for another 5 minutes.
6. Mix in the soy sauce, mirin, and sugar, stirring gently.
7. Add the tomato wedges and cook for 2-3 minutes until heated through but not mushy.
8. Drizzle sesame oil over the dish and stir lightly.
9. Serve warm, garnished with chopped green onion if desired.