Parsnip And Leek Soup With Cumin And Mustard Seeds

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13 Ingredients

• 2 tsp. ground turmeric
• 2 medium leeks (white and light-green parts only), trimmed, washed, and sliced crosswise about 1/...
• Kosher salt and freshly ground black pepper
• 2 Tbs. extra-virgin olive oil
• 2 tsp. cumin seed
• 4 medium cloves garlic, roughly chopped
• 1/2 tsp. cayenne
• 1 large yellow onion, cut into medium dice (2 cups)
• 1 lb.  medium parsnips, peeled, cored , and cut into medium dice (about 2 cups)
• 6 cups lower-salt chicken broth; more as needed
• 2 Tbs. unsalted butter
• 2 tsp. black mustard seed
• 1 lb. yellow potatoes (like yukon gold), peeled and cut into medium dice (2-3/4 cups)