How to Make It
In a small frying pan, toast the pine nuts over moderately low heat, stirring frequently, until golden brown, about 5 minutes. Or toast them in a 350° oven for 5 to 10 minutes.
In a large glass or stainless-steel bowl, whisk together the vinegar, mustard, salt, and pepper. Add the oil slowly, whisking.
Add the parsley, scallions, tomatoes, and mushrooms and toss. Top with the pine nuts.
Quick From Scratch Herbs & Spices