Place the butter and soft light brown sugar in a mixing bowl. Whisk until creamy.
Add the eggs and vanilla. Whisk again to combine.
Briefly whisk in the pumpkin puree.
Sift in the self-raising flour and pumpkin spice (mixed spice) and fold through.
Pipe and bake
Transfer the batter to a piping bag and snip off the end to create a 2cm-wide hole. Pipe the batter into the greased doughnut moulds. You have enough for 12 in the donut pan pictured but in smaller/larger or shallower/deeper pans, you may get more/less.
Bake for approximately 30-35 minutes until risen and firm. Transfer to a wire rack to cool completely.
To make the glaze
Sift the icing sugar and into a mixing bowl and add the lemon juice.
Mix to a thick, pourable icing.
Take the completely cooled doughnuts and dip half way into the glaze, then back on the wire rack to set.
Garnish with a pinch of pumpkin spice (mixed spice) and leave to set