Rhubarb and orange crumble muffins

225g fresh rhubarb

125g sugar

225g plain flour

2 ½ tsp baking powder

¼ tsp grated nutmeg

1 large egg

125 ml milk

80g of melted butter

1 orange

1 tsp vanilla essence

For the crumble topping:

40g butter

40g soft brown sugar

40g flour

1/2tsp cinnamon

2 tbsp flaked almonds