Blanch the green beans. Drop the trimmed beans into a small pot of boiling water and cook for 2 minutes. Drain the beans and immediately plunge them into iced water to stop the cooking. Drain and set aside.
Prepare the vinaigrette and salad. Combine olive oil, rice vinegar, miso paste and lemon juice in a small bowl and whisk to blend completely. Set aside. Put mixed greens in a large salad bowl; mix green beans and snow pea pods in a separate small bowl. Having everything ready to go is key—the salmon cooks very quickly, and you want the salads assembled and set to go.
Prepare the salmon. Place salmon fillet on a cutting board, flesh side up (the non-skin side—you can tell the difference, even with the skin removed). Using a very sharp knife (see Kitchen Notes), slice the salmon across the grain into 6 equal strips. Quickly reassemble the fillet and season the flesh side (now the edge of the strips) with Japanese chili pepper or cayenne pepper (use a light hand) and salt to taste.
Assemble salads before cooking salmon. Toss mixed greens with most of the vinaigrette and a little salt, drizzling a little of it over the green beans and pea pods and reserving a little to drizzle over the salmon. Divide mixed greens between two plates. Top with green beans and pea pods and scatter cilantro leaves over the assembled greens.
Cook the salmon. Heat a large nonstick skillet over medium-high flame. Add a tablespoon or so of grapeseed oil and cook three of the salmon slices about 1 minute per side. Transfer to a plate, then carefully fan salmon strips on top of salad. They will be somewhat fragile, so handle carefully and try not to freak out if they break up on you. Repeat with remaining salmon slices, assemble second salad and serve.