Mango Yogurt Mousse Cake

Ingredients

• Crust

  • 7 oz (200 g) langues de chat cookies or graham crackers
  • 1/3 cup (75 g) unsalted butter, melted

• Mousse

  • 1 tbsp gelatin
  • 3 tbsp (45 ml) water
  • 1 3/4 cups (430 ml) mango purée (see note)
  • 1 cup (250 ml) 35% whipping cream
  • 1/2 cup (105 g) sugar
  • 1 cup (250 ml) plain Greek yogurt
  • 1 mango, ripe but firm, peeled, pitted and thinly sliced