In small bowl, whisk together the lemon juice, mustard, 4 tablespoons olive oil, salt and pepper to taste. Add more olive oil if you want a less tart flavor. Set aside.
Cut the broccoli into bite-size florets. Rinse well. Steam in batches until just barely past raw, 1 to 2 minutes. Immediately drain well and turn out into a serving bowl.
Pour the dressing over and mix well. Add the red peppers and mix again.
Just before serving, sprinkle the salad with the cashews.
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