Gluten-free melomakarona

For the mixture

100 g oat flour 60 g walnuts 6 soft dates (pitted – about 100g) 1 tsp cinnamon ¼ tsp ground cloves 1 pinch salt 1 tbsp orange zest 1 tbsp orange juice 2 tbsp honey 1 tbsp olive oil 1 tbsp oat milk 30 g crushed walnuts (for serving)