PROVENçAL VEGETABLE SOUP (SOUPE AU PISTOU)

Steps:

• Make soup:
• Cook leek, celery, carrot, garlic, and thyme sprig in oil with 1/2 teaspoon salt and 1/4 teaspoon pepper in a 5-to 6-quart heavy pot over medium heat, stirring occasionally, until vegetables brown and stick to bottom of pot, 10 to 15 minutes.
• Add potatoes and chard stems with 1/2 teaspoon salt and cook, stirring occasionally, until beginning to soften, about 5 minutes. Add water and bring to a boil, stirring and scraping up brown bits.
• Stir in edamame, zucchini, green beans, pasta, chard leaves, and 1/4 tsp salt and simmer, uncovered, until pasta is al dente and vegetables are tender, about 10 minutes. Discard thyme sprig.
• Meanwhile make pistou:
• Heat a dry small skillet (not nonstick) over medium heat until hot, then char tomato on all sides. Core tomato, then purée with basil, parsley, and garlic in a food processor. Add oil and cheese and blend well.
• Remove soup from heat and stir in half of pistou and salt and pepper to taste. Serve soup with remaining pistou.