Using a mandoline slicer on the thinnest setting (mine has blades for both “wide” and “thin” ribbon… I used thin; if you use wide, it looks more like fettuccini), slice the cucumber. It should look like 6 inch long spaghetti. Place in a mixing bowl. In a small mixing bowl, combine dill, salt and pepper, then vinegar, oil and cream. Gently toss to combine, taste and re-season if necessary. Serve immediately.