Make Cucumber Canapés with Smoked Salmon Mousse for an elegant, easy-to-pipe party starter that delights guests.
Place the smoked salmon, softened cream cheese, sour cream, mayonnaise, chopped fresh dill, minced garlic, lemon zest, lemon juice, salt and pepper into a food processor and blitz until completely smooth and homogenous. Scrape the bowl once or twice so the texture becomes velvety and without streaks; the mousse should read as a pale, glossy salmon-pink paste with tiny green flecks of dill and visible lemon zest specks. Transfer the mousse into a piping bag fitted with a wide star tip (about 1.5–2 cm), press out any air, then refrigerate until the mixture firms slightly — about 5 hours — so it holds a defined piped swirl.

Trim and slice long English cucumbers into 1.5 cm (0.6") thick rounds, keeping the slices clean and even for a tidy canapé base. Use a small melon baller or a teaspoon to scoop a shallow well from the center of each slice, leaving a crisp green rim and a neat, moist cavity to accept the mousse. Pat the cucumber rounds lightly on a paper towel if they feel wet; you want the cavity to be slightly dry so the mousse sits cleanly on top.
Fit the chilled piping bag and pipe a generous star-swirl of smoked salmon mousse into each cucumber well so each canapé shows a defined ridged swirl with a soft peak. Finish each piece with a tiny sprig or flake of fresh dill and arrange lemon wedges nearby for serving. Plate immediately and enjoy — the contrast between the glossy, airy mousse and the crisp, wet cucumber rim is the whole point here.
