Steps

1. Trim the base of the mizuna (1 bunch).
   🕒 00:55
2. Chop the trimmed mizuna into 5cm segments.
   🕒 01:01
3. Place the chopped mizuna into a salad spinner.
   🕒 01:40
4. Soak the mizuna in the salad spinner in water for about 5 minutes to remove bitterness and achieve a crisp texture. (The Key Tip!) Soaking mizuna in water removes its bitterness and makes it crisp. After soaking for about 5 minutes, thoroughly drain the water using a salad spinner to prevent sogginess.
   🕒 02:07
5. Thoroughly drain the water from the soaked mizuna using a salad spinner.
   🕒 02:35
6. Prepare a large bowl for mixing.
   🕒 03:15
7. Prepare the salt, MSG (Umami Seasoning), and oil for stir-frying.
   🕒 03:38
8. Heat a frying pan over medium-low heat.
   🕒 03:47
9. Add oil to the heated frying pan and let it get hot. (The Key Tip!) By heating the oil thoroughly before stir-frying, you can quickly coat the mizuna and prevent sogginess.
   🕒 04:05
10. Add all the mizuna to the hot frying pan.
    🕒 04:42
11. Stir quickly to coat the mizuna evenly with the oil.
    🕒 05:02
12. Once the mizuna is coated with oil, add a pinch of salt and 4 shakes of MSG (Umami Seasoning).
    🕒 05:50
13. Stir briefly to combine the seasonings. (The Key Tip!) When the mizuna has reduced to about half its original volume, it's done. Overcooking will lead to sogginess.
    🕒 06:00
14. Immediately transfer the stir-fried mizuna to the prepared bowl. (The Key Tip!) To prevent further cooking from the residual heat of the pan, transfer it to the bowl right after stir-frying.
    🕒 06:23
15. Add the canned tuna (1 can) to the bowl with the mizuna. (The Key Tip!) Adding the tuna without stir-frying prevents its fishy flavor from overpowering the dish and allows the natural flavors of the ingredients to shine.
    🕒 06:46
16. Grind in some fresh black pepper.
    🕒 06:56
17. Gently toss to combine, being careful not to overmix. (The Key Tip!) Overmixing can cause the tuna to release moisture, leading to dryness or sogginess, so a light toss is sufficient.
    🕒 07:00
18. Taste before serving and adjust the flavor with Mentsuyu (Noodle Soup Base) if you prefer a stronger taste.
    🕒 07:27