Put oil, breadcrumbs, parmesan, pepper, salt and lemon juice in a bowl and mix together. Clean the Brussels sprouts, cut in half and add to the breadcrumbs mixture and stir.
Place Brussels sprouts on a baking sheet lined with baking paper and roast them in a hot oven at 180 ° C top / bottom heat for about 30 - 40 minutes. From time to time to turn.