1 (2-pound) butternut squash , peeled, seeded, diced into 1/2-inch to 3/4-inch cubes, yielding about 6 cups of cubed squash (see how to cut and peel a butternut squash )
Extra virgin olive oil
1 teaspoon butter
1 large yellow onion, chopped
2 teaspoons yellow curry powder
1 teaspoon whole mustard seeds (if you substitute ground mustard, only use 1/4 teaspoon)
Dash ground cumin
1 tablespoon minced fresh ginger
4 cups chicken stock (homemade or store-bought)
1 teaspoon salt , plus more to taste
1/2 cup sour cream (can substitute plain yogurt)
1/4 cup chopped fresh cilantro (can substitute parsley)
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