To make the dressing, mix the oil, lemon juice, vinegar, mustard, salt, and pepper. To make the salad, peel the onions, and slice thinly. Peel the pepper and cut into 1.5 by 1/2 inch strips. Tear the greens into bite sized pieces. To serve, toss greens, and vegetables with the dressing. Adjust the seasonings and vinegar if necessary. Let it rest a few minutes before serving.{$7e}(Original recipe for 6)