To make thick yogurt using plain yogurt, line a fine-mesh strainer with a muslin cloth. Add the yogurt to the strainer and let it sit over a bowl for 20 minutes. All the extra water will drip down and you will get thick yogurt.Lime juice and zest can be replaced with lemon juice and zest.You can also add fresh herbs like fresh parsley, fresh chives, or basil but the shelf life will reduce a little.Add a little heat to the dip by adding some hot sauce or cayenne pepper.