Using a vegetable peeler, shave the cucumber into thin ribbons, turning often so the ribbons are of equal width. Place in a bowl.
Whisk the vinegar and sugar and pour over the cucumber.
Meanwhile, brush the bread on both sides with oil then rub with the cut garlic. Lightly toast both sides under a medium-heat grill.
To serve, top the crostini with the feta or twists of smoked salmon and curls of cucumber. Season. Serve as a nibble with drinks.
Makes 4.
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