Cooking Nanna Tate potatoes gently in lots of oil turns them fudgy, rich and delicately soft – it's one of our favourite ways to prepare them. Infusing the oil with cumin and garlic adds extra flavour, and sitting them on a bed of tahini-spiked yoghurt creates the ultimate side dish (especially for roast lamb). The leftover oil can be used in cooking or for dressing anything that needs a kick of garlicky, cumin-infused richness too.
Preheat the oven to 160°C. Peel the potatoes and halve them (or quarter any particularly large ones – you want each piece to be roughly the same size). Put them in a deep baking dish with the garlic cloves, cumin seeds and thyme. Season well with salt and pepper
Pour over the olive oil, turning any potatoes not fully submerged so they’re at least coated in the oil. Cook for 1 hour 15 minutes in the oven, gently turning the potatoes halfway
Meanwhile, make the yoghurt. Whisk the yoghurt and tahini together, then stir in the lemon zest and juice with a pinch of salt. Add a splash of water to loosen it a little (2-4 tbsp)
Take the potatoes out of the oven and discard the thyme. Put the tahini yoghurt in a bowl (or spread it out on a large platter), then carefully lift the potatoes and garlic cloves out of the oil and arrange on top, spooning over a little of the cumin-infused oil too. Finish with some parsley, lemon zest and a final sprinkle of cumin seeds
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