Pre heat the oven to 220C / 200C fan. Line two baking trays with parchment paper.
Melt the vegan butter and soy milk over a medium heat and bring to a light boil.
Combine the flour, cornstarch, sugar, baking powder, bicarbonate of soda and salt in a large bowl.
Pour in the melted butter and milk and beat vigorously until you have a silky, smooth texture. The dough should be reluctantly dropping off the spoon.
Add the dough to a large piping bag with a star nozzle. Pipe the dough in a spiral pattern from the inside out.
Place in the oven for 15 minutes. The pastries are ready when they are a deep golden brown and slightly firm to the touch. Remove and leave to cool on a wire rack.
Chop the pecans into fine pieces. Toast the nuts in a dry frying pan over a moderate heat for 3 minutes.
Prepare the glaze by adding the icing sugar, vanilla and soy milk to a bowl. Whisk until the mixture is smooth and glossy.
Dip the choux buns into the glaze and smooth over with a pastry brush. Sprinkle each bun with a dusting of nuts and dried strawberries.