Instructions: With a small knife trim a strip down the length of the rounded side of each celery rib to form a flat bottom and cut the ribs on the diagonal into 1 1/2-inch boats. Put the celery boats in a bowl of ice and cold water and chill them, covered, until ready to assemble the hors doeuvres.

Cut 6 ounces of the Gruyere into 1-inch-julienne strips and grate fine the remaining 2 ounces. In a food processor or blender combine the grated Gruyere and the pine nuts and blend the mixture until it is minced fine. Add the basil and the vinegar and blend the mixture until it is a paste. With the motor running add the oil in a stream and blend the pesto until it is emulsified.

In a bowl toss the julienned Gruyere with the pesto and fill the celery boats, drained and patted dry, with the mixture. The hors doeuvres may be made up to 1 day in advance and kept covered and chilled. Serve the hors doeuvres at room temperature.

This recipe yields about 50 hors doeuvres.

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