Stir together salt and yogurt and pour the mixture into the cloth.
Bring the corners of the muslin together and twist to form a tight ball.
Place the sieve over a bowl to collect any liquid that drips down (whey).
Place the bowl in the fridge and allow to drain for 24-48 hrs or until the yogurt is very thick and creamy.
Transfer the thick yogurt to a mixing bowl and mix with ground sumac.
Transfer the labneh into the serving bowl and spread it using the back of a spoon. Drizzle on some extra virgin olive oil. Sprinkle some sumac powder on top and enjoy!
Notes
You can also garnish the dip with pomegranate seeds, red pepper flakes, and mint leaves.