Clementine Mousse Sandwich Cookies

Ingredients

• • 1/2 tsp gelatin
  • 1 tbsp (15 ml) cold water
  • 2 tbsp sugar
  • 2 tsp cornstarch
  • 1 egg
  • 1 clementine, zest finely grated
  • 1/3 cup (75 ml) clementine juice
  • 1 tbsp (15 ml) lemon juice
  • 1/4 cup (60 ml) 35% whipping cream
  • 16 store-bought ginger cookies (see note)