-
Preheat the oven to 350°F.
-
Make the meatballs: In a medium-sized mixing bowl, mix the ground beef and pork, onion, garlic, egg, salt, and pepper with your hands until just combined. Form the mixture into meatballs 1½ inches in diameter.
-
Melt the ghee in a large oven-safe skillet over medium-high heat. Add the meatballs and cook for 5 minutes, turning frequently, until browned on all sides. Transfer the skillet to the oven and bake for 18 to 20 minutes, until the meatballs are cooked through.
-
While the meatballs are cooking, make the sauce: Place all of the sauce ingredients in a medium saucepan over medium-high heat and whisk to combine. Bring just to a boil, then reduce the heat to low and simmer for 3 to 5 minutes, until the sauce has thickened, stirring occasionally. Taste and add additional chipotle powder or dry mustard if desired.
-
Once the meatballs are done cooking, use a slotted spoon to transfer them to the pan with the sauce and toss to coat. Sprinkle with chopped green onion, if desired, and serve.