Heat all ingredients for the red curry sauce in a saucepan over medium heat. Bring to a gentle, yet controlled boil. Cook, stirring occasionally, 15 minutes. Remove from heat and set aside until ready to use. Note: the sauce will become even more flavorful as it sits - you can prepare the sauce up to 1 week ahead of time and re-heat when necessary.
Prepare the Meatballs and Squash:
Prepare the Thai Meatballs according to instructions, and roast the spaghetti squash (if you are new to roasting spaghetti squash, use these instructions).
Serve meatballs over spaghetti squash with red curry sauce. If desired, serve with green onion, cilantro, and sesame seeds.