Place a pan over a medium heat and fill with 2cm of water, then pop a steamer/colander on top. Place the beef and sweet potato into the steamer, cover with a lid and steam for 10 to 15 minutes, or until cooked through.
Transfer the mince and sweet potato to a blender (use a hand-held stick blender, if you prefer) or bowl.
Add the ricotta and a small drizzle of oil, then either blend to a puree, pulse, mash and/or finely chop depending on the stage your little one is at. (for more information on stages of complementary feeding, click here). If it’s a bit too thick, add a little water to loosen. Pick over the thyme before serving (if using).