Trim the celery and carrot, scrub and trim the beetroot and halve, peel and trim the onion. Place all the veg onto a tray, drizzle lightly with oil, then roast for 45 minutes to an hour, or until soft.
Place a ragù pan on a medium heat and add a little oil. Peel and fry off the whole garlic until golden. Add the mince for a further 3 minutes, or until browned.
Add the tomatoes and 500ml water, then stir together. Bring to the boil, then reduce to a simmer for 1 hour, or until reduced and thickened nicely. Remove the garlic.
Place the roasted veg into a blender (use a hand-held stick blender, if you prefer), or a bowl, 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.). Stir it into the pan, then serve.