Slice tofu 1/4 inch thick. Place on cutting board between paper towels; top with baking sheet. Top with weight; let stand 10 minutes. Soak red onion in cold water.
STEP 2
Whisk together vinegar, sweet chili sauce, olive oil and salt. Pat onion dry; toss with half of vinaigrette and cucumber.
STEP 3
Sprinkle tofu with cornstarch. In skillet, heat vegetable oil until hot. Add tofu and cook until golden brown, 2 to 3 minutes per side. Drain on paper towels.
STEP 4
Divide quinoa among bowls. Top each with salad, cashews, parsley, and tofu. Serve with remaining vinaigrette.