Steps
1. Prepare Date Jam: Combine dates and water in a small saucepan and simmer over low heat until dates are soft and form a jam-like consistency. Mash with a fork. Set aside.
2. Make Brownie Batter: Preheat oven to 175°C (350°F). Blend dates until smooth. In a bowl, whisk egg, sugar, and vanilla extract. Slowly add melted butter and date puree. Fold in flour and salt until just combined.
3. Bake Brownie: Pour batter into a greased small baking dish or ramekin. Bake for 15-18 minutes or until a toothpick comes out clean. Cool completely.
4. Prepare Pistachio Mousse: Blend pistachios into a fine powder. Whip cream with powdered sugar until soft peaks form, then fold in ground pistachios gently. Chill.
5. Make Pistachio Glaze: Warm pistachio paste gently with milk until smooth.
6. Candy Pistachios: In a pan, dissolve sugar in water over medium heat. Add pistachios and stir until sugar crystallizes and coats pistachios. Spread on parchment paper to cool.
7. Assembly: Slice cooled brownie. Spread a layer of date jam on top, then a generous layer of pistachio mousse. Drizzle pistachio glaze over the mousse and sprinkle with candied pistachios.