Easy Pumpkin Curry

Name: Easy Pumpkin Curry
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: Thai
Ingredients: 1 tablespoon olive oil; 1 large yellow onion (, chopped); 1 red bell pepper (, chopped); 4 to 5 teaspoons curry powder; 2 inches freshly minced ginger ((about 2 tablespoons)); 2 garlic cloves (, minced); 1 (13.5 oz) can coconut milk; 1 (14 oz.) can pumpkin puree; 1 pound cauliflower florets (, cut into small pieces); 1 (15 oz.) can chickpeas (, rinsed and drained); fine sea salt (, plus more to taste); 1 teaspoon lemon juice; 2 tablespoons pure maple syrup ((optional)); 2 cups fresh baby spinach ((optional)); Cooked rice (, for serving)