Trim ends off cucumbers. Split each cucumber in half lengthwise. Scoop out center of cucumbers, leaving a 1/4- to 1/2-inch-thick shell. Cut into 24 (1 1/2-inch-long) pieces. Reserve any remaining cucumber for another use.
Combine yogurt, salmon, and onion in a food processor; process until almost smooth, scraping sides of bowl as needed. Spoon 2 teaspoons salmon mixture into each cucumber piece.
Made this exactly as specified, and serve it as part of a group of appetizers that ended up being a full meal. One of my guests absolutely loved it, although his wife and I thought the salmon was a little overpowering. If you're a smoked salmon lover, you definitely need to try this. It goes together in less than 10 minutes; the presentation is lovely.
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