Creamy Curried-Pumpkin Dip

3 tablespoons vegetable oil 1 medium onion, finely chopped Kosher salt and freshly ground black pepper One 2-inch piece ginger, peeled and finely grated (about 1 tablespoon) 3 cloves garlic, finely grated 1 1/2 teaspoons curry powder 1 teaspoon fresh thyme leaves, roughly chopped 1/4 teaspoon ground allspice One 15-ounce can pure pumpkin puree 1 cup coconut milk Zest and juice of 1 small lime 1 teaspoon honey Plantain chips, sweet-potato chips and/or warm naan bread, for serving