Heat the avocado oil in a large skillet over medium-high heat. Add the onion and saute, stirring occasionally, until it turns translucent, about 5 minutes.
Add the ground beef to the skillet and allow it to brown for 2 minutes before flipping it and allowing the other side to brown another 2 minutes. Use a spatula to chop up the beef and stir it into the onion.
Pour the sauce into the skillet with the beef and bring to a full boil. Reduce the heat to a gentle boil and continue cooking until the sauce has thickened, about 8 to 10 minutes.