After pitting, soak the dates in freshly boiled water for 10 minutes.
Pre-heat the oven to 160C/320F fan forced and place a rack in the middle of the oven.
Chop the pecans in to small pieces.
Drain the dates and then chop finely.
Mash the banana in a bowl and add the dates, then mix everything together with the vanilla essence.
Add the remaining ingredients and mix thoroughly- the mixture will be more like a batter than a dough.
Line a cookie sheet with parchment paper. Use 1 heaped tablespoon of mixture to form biscuits on the tray. Repeat for the remaining mixture. Place a pecan piece on the top of each cookie. Tidy the shape of the cookies into a circle.
Bake for 12-15 minutes, turning at the halfway point. They're done when the edges are a light golden brown. Allow to cool on the tray. Store at room temperature in an airtight container for up to 3 days or in the fridge for a week. The cookies can also be frozen for up to a month - defrost at room temperature.