Heat the olive oil over a medium heat and add the onion, garlic and bay leave. Allow to fry for a couple of minutes.

Add the rest of the ingredients except the cheese. Reduce the heat and simmer gently for 20-25 minutes or until the mixture has reduced and the liquid has thickened.

Allow the mixture to cool enough to place in a blender. Remove the bay leaf and blend until the mixture is smooth. Add the sauce back to the saucepan. (Step 3 can be missed, depends on the child's preference).

Add cooked meatballs to the mixture.