Bring a large pot of salted water to a boil and fill a large bowl with ice water. Drop green beans into boiling water and cook until tender, about 3 minutes. Drain and immediately plunge into ice water. Once cool, remove onto paper towels to absorb excess water.\nIn a small bowl, whisk 1 Tbsp Southeast Asia sauce into the mayonnaise. Set aside.\nHeat 1 Tbsp oil in a large skillet over medium-high heat. Once hot, add blanched green beans and cook until starting to brown, about 2 minutes. Add sliced shallots and sauté until softened, about 1 additional minute. Pour in 1\/4 cup Southeast Asia sauce and stir until heated through, about 2 minutes. Add cashews and toss to coat.\nPour cooked green beans into a serving bowl and drizzle with Southeast Asia mayonnaise.