Preheat oven to 350�F.
Spread walnuts on a rimmed baking sheet. Toast in oven, tossing once, until fragrant, 8-10 minutes. Let cool; chop.
Blanch green beans in boiling salted water for about 1-1/2 minutes. Drain and cool.
Whisk lemon juice, vinegar, and sugar in a small bowl. Whisking constantly, gradually drizzle in oil. Season vinaigrette with salt.
Crumble cooked rice with your fingers. Toss rice, walnuts, scallions, edamame, tomatoes, and green beans with vinaigrette in a large bowl. Season with salt and pepper.
Serves 6.
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