– 1 sheet frozen puff pastry, thawed – 8 ounce tub of creme fraiche (substitute mascarpone cheese, or Boursin cheese) – zest of 1 lemon – 1/2 lb thin asparagus, trimmed to about 6 inches long – maple syrup, for brushing (a few tablespoons) – sea salt – a handful of fresh herbs like thyme for a garnish, if desired.