Steam the asparagus for 10 minutes.
In a bowl, combine the flour and yeast with 1 teaspoon of sugar, add 1/2 cup of warm milk, a little at a time, stirring well.
In another bowl, beat the eggs with the milk, a drizzle of oil, salt and pepper. Pour this beaten mixture into the larger bowl, add the grated Grana Padano Riserva and mix well.
Grease a rectangular mould and dust with wholemeal flour, pour in the mixture and place the asparagus in between.
Bake in a preheated oven at 180 °C for 25-30 minutes.
Let cool before unmoulding and serve immediately.