Heat 1 tablespoon canola oil in a large skillet over medium-high heat. Add tempeh; cook for 3 to 5 minutes or until golden and edges slightly crisp, gently stirring occasionally. Remove from heat. Cool.
Cut peas diagonally in half. On a platter, arrange peas, spinach, napa cabbage, red cabbage, green onions, and tempeh.
For dressing, in a screw-top jar, combine 2 tablespoons canola oil, the rice vinegar, mint, honey, and ginger. Cover and shake well. Drizzle dressing over salad.