These include almond, apple, butter, buttered popcorn, coconaut, citrus, coffee, peanut butter, strawberry, mint, and dozens of others. I have used these with stroke
-disabled elderly patients with dysphagia
oprior to attempting to feed them. You place a drop on a "Q" tip and waft it near their nostrils. Just like in Pavlov's dog experiment this often generates saliva. And they get "hungry". A minute later I would provide a teaspoon of milkshake.