Chef John's Butternut Bisque
Ingredients:
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3 tablespoons butter
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1 large onion, diced
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1 teaspoon kosher salt, plus more to taste, divided
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1 (2 pound) butternut squash
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2 tablespoons tomato paste
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1 quart chicken broth
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1 pinch cayenne pepper
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½ cup heavy cream or creme fraiche, plus more to garnish
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2 tablespoons maple syrup, or to taste
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Chopped fresh chives for garnish
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Pomegranate seeds for garnish