Thai Curry Sweet Potato Soup

2 tbsp (25 mL)  vegetable oil1 medium 0nion, chopped2 cloves garlic, minced2 tsp (10 mL)  finely grated fresh gingerroot1 tsp (5 mL)  each ground cumin, coriander and turmeric1/4 tsp (1 mL)  crushed red pepper flakes2 cups (500 mL)  vegetable or chicken broth4 cups (1 L)  cubed peeled sweet potatoes (about...

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