Wash the potato and carrot and chop them into large pieces without removing the skin. Cut onion into quarter wedges with its core intact. Separate broccoli into florets. Remove the stem from the tomatoes.
Heat olive oil in a pot over medium heat and add pork ribs, spreading it out. Cook until the pork changes its color. Add water, potato, carrot, onion, and 1/2 of miso, and bring to a boil. Lower the heat and simmer for 10 minutes. Add broccoli and simmer for another 5 minutes.Tips: Adding miso in two separate stages is the key. The first stage is to infuse the miso flavor into vegetables thoroughly and the second stage is to enhance the flavor.