Bring a medium saucepan of water to the boil for the noodles. Trim the beans and halve on an angle. Thinly slice the radish. Combine half the sesame seeds, 2 tsp white vinegar and 1 tsp sugar in a large bowl. Add the radish and toss to combine. Set aside to pickle, tossing occasionally, until needed.
Step 2 — Prep and cook fish
Put 1 tbs plain flour in a shallow bowl and season with salt and pepper. Pat the fish dry with paper towel and coat in the flour. Heat 2 tsp vegetable oil in a medium deep frypan over medium-high heat. Cook the fish, skin-side down, covered, for 3 mins. Turn and cook, uncovered, for 4 mins or until cooked through. Remove from the pan and season with salt. Reserve the pan.
Step 3 — Cook noodles and beans
Meanwhile, cook the noodles and beans in the pan of boiling water for 2-3 mins until tender. Drain, then rinse under hot water to prevent the noodles from sticking.
Step 4 — Make sauce
Return the reserved pan to medium-high heat. Add 80ml (⅓ cup) water and cook, stirring, for 1 min to deglaze. Stir in the miso, 3 tsp soy sauce, 1 tsp white vinegar and 1 tsp sugar and cook for 1 min or until well combined. Stir in the noodles and beans until well coated. Remove the pan from the heat. Taste, then season with salt and pepper.
Step 5 — Serve up
Divide the miso noodles and beans, barramundi and pickled radish among plates, then drizzle with the pickling liquid. Scatter over the remaining sesame seeds and enjoy!
Step 6 — Kitchen 101
Cooking times may vary depending on thickness of fillets. To check if your fish is cooked through, simply use a fork or the tip of a knife to take a peek inside the thickest part of the fish; if it comes apart easily, the fish is cooked.