Preheat the oven to 200 degrees, on the grill.

At the same time, cut the onions into slices and spread them on a baking tray with greaseproof paper.

Sprinkle with olive oil, season with salt and pepper and put them in the oven for about 10-15 minutes.

In a bowl, pour mayonnaise, yogurt, zest of a lemon, salt and chopped onions.

Add olive oil, melted garlic and mix well.

Serve sprinkled with chopped parsley and with chips of your choice.