Preheat oven at 170°C.
Chop the vegetables in large chunks, place in a large roasting tray, season with olive oil and salt.
Wrap garlic cloves, unpeeled, in foil and place in a corner of the roasting tray.
Roast vegetables for 40-50 minutes.
Turn off oven and remove garlic from tray (leave the tray in the oven to keep the rest of the vegetables warm), squeeze cloves into the jug of a food processor or blender along with the rest of the pesto ingredients. Process until it reaches desired consistency, season to taste.
Heat fat of choice in a saucepan and brown meat. Season with salt and pepper, stir until cooked through.
Mix beef and pesto and serve on top of vegetables.