In a blender, blend all the sauce ingredients with ¼ cup water until smooth. Taste and adjust the seasoning.
Miso Pasta:
Bring a pot of water to a boil and cook your soba noodles per package instructions.
Drain and rinse the soba noodles under cold running water. Drain them in a large bowl. Toss and coat the noodles in a sesame oil to prevent them from sticking.
Heat the oil in a skillet over medium-high heat. Add shitake mushrooms to the pan and cook until the water evaporates. Add in minced garlic and the scallion whites and saute until fragrant about a minute. Add in edamame, sugar snap peas and toss till it becomes bright green about a minute or two. Remove from heat and add all the veg to the bowl of noodles.
Add in the sauce 4-5 tablespoons of sauce and toss till everything is well coated. Taste and adjust seasoning, Add more sauce if desired. Garnish with scallion greens and sesame seeds.