I've made this for years, and originally borrowed it from Practical Paleo, where I think it was called Butternut Squash Chili or something similar. Here's my take with ingredients I can procure here in Japan. 
You'll need:
- about 1 kg of ground meat (in Japan they have a mix of beef and pork)
 - 2 cans of chopped tomatoes (about 450 g each)
 - 2 carrots, peeled and chopped
 - 3 Japanese sweet potatoes, peeled and chopped
 - a bunch of garlic, crushed
 - 1/2 of a kabocha pumpkin, chopped small
 - 1 onion, diced
 - 1 red or yellow pepper, chopped
 - 3 tablespoons tomato paste
 - 1 tablespoon unsweetened cocoa powder
 - 2 tablespoons chili powder
 - 1 tablespoon cinnamon
 - 1.5 tablespoons sea salt
 - 1 teaspoon black pepper
 
Do this:
Cook your ground meat in a pan on the stove, then bung that with the rest of the ingredients in a slow cooker and whack it on high heat for the day. Enjoy with cornbread and salad and friends. Just don't eat the friends. 
