This warm potato salad with a garlicky mayo is a delicious change from regular roast potatoes
Preheat the oven to 200˚C/400°F.
Place unpeeled garlic for the dressing on baking paper, drizzle with oil and bake for 10 minutes or until cloves are soft. Set aside to cool.
Cut the potatoes into large chunks and slice each onion into 6 wedges through the root end. Toss the potatoes, and onions with the olive oil and place in a single layer on two large baking trays. Season generously. Roast for about 40 minutes until the potatoes are golden and tender, turning everything a couple of times and removing the onions when they are cooked. The potatoes will take longer to cook.
For the dressing, squeeze the flesh from the roasted garlic into a bowl. Finely chop 4 tablespoons of the walnuts and combine with the remaining ingredients, adding lemon juice to taste. Season.
To serve, toss the warm potatoes and onions with enough dressing to coat and transfer to a serving bowl. Scatter with the remaining walnuts, grated parmesan, and season. Serve the remaining dressing separately.