On a rimmed baking sheet, toss the tomatoes with 3 tablespoons of the Miso dressing and season with salt. Roast for 20 minutes, stirring, until the tomatoes are charred in spots. Scrape into a large bowl (for a quicker version look at my suggestion in step 1)

Cook the soba in boiling water just until al dente (4 min). Drain and cool under cold running water. Add the soba, scallions (I prefer using green onions) and half of the remaining dressing to the tomatoes and toss well. Serve and garnish with sesame seeds (I use furikake). Serve with the remaining dressing