Do not overmix the meatball mixture or the texture will become dense and rubbery. Mix just until combined. Always wait until the meatballs are nearly fully cooked before applying the glaze to prevent the sugar from burning. Keep the cream sauce on a gentle simmer and never let it boil hard, or the cream may break and turn grainy. For a dairy-free version, substitute full-fat coconut cream for the heavy cream. Meatballs freeze well for up to 3 months without the cream sauce — make the sauce fresh when ready to serve.