For the dressing: Whisk the vegetable oil, vinegar, sesame oil, ginger, soy sauce and sugar in a medium bowl. Sprinkle with salt and pepper to taste.
For the salad: Mix the onions, cabbage, jalapeno and green pepper in a large bowl. Toss the salad with enough of the dressing to coat. Sprinkle with salt and pepper to taste. The salad can be made 3 hours ahead, covered and chilled. When ready to serve, mix in the cilantro and garnish with the peanuts on top.