Great question — answering as the UphillTech team:
Probably. I rarely have buttermilk around, and I most commonly substitute yogurt mixed with water. The kind of laban you're talking about* would be a similar mixture. King Arthur Baking Company has published this nice article about buttermilk substitutions on their website: Here are the most common suggestions [for substitutions]: 1 tablespoon vinegar or lemon juice mixed into 1 cup of milk. Let the milk stand for 10 to 15 minutes, until it thickens very slightly and curdles. 1 3/4 teaspoons cream of tartar mixed with 1 cup of milk. Shake until the cream of tartar dissolves. Sour cream thinned with milk or water to the consistency of heavy cream. Plain unsweetened kefir. Yogurt thinned with...
Full answer by Juhasz: https://cooking.stackexchange.com/a/122169 (CC BY-SA 4.0).
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