Halve squash, scoop out seeds, set cut side down in 9 x 13 pan, then add about an inch of water to pan. Bake until tender, about an hour (see note). Scoop out the flesh and reserve.
Heat the oil over medium heat and sautee the onion, ginger and garlic until softened but not brown, 5-10 minutes. Add the curry paste and cook for a few more minutes.
Stir in the broth, coconut milk, salt, and squash. Heat until warm, about 10 minutes. Stir in the lime juice.
Puree soup with a hand mixer or in batches in a blender (slowly and carefully since hot soup can spurt). Garnish if desired
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Notes
Or use your favorite squash roasting method. My butternut squash yielded about 3 cups of mash. You could probably sub with a single can of canned since that usually has a lower moisture content.
I am not a health professional and nutrition data is calculated programatically. Accuracy may vary with product selection, calculator accuracy, etc. Consult a professional for the best information.