Orzo Salad

INGREDIENTS

• Salt, to taste
• 1 lb. dried orzo pasta
• 1 cup fresh English peas
• 1 to 2 Tbs. plus 1/4 cup extra-virgin olive oil, plus more for brushing
• 1/2 cup grapeseed oil
• 2 Tbs. red wine vinegar
• 1 Tbs. Dijon mustard
• Freshly ground pepper, to taste
• 1
• red and white onion, cut into slices 1/2 inch thick
• red, orange and yellow bell pepper
• 1 cup minced fresh flat-leaf parsley
• 12 small heirloom tomatoes, about 3 lb. total, cored and quartered