Slice the sirloin steak in half lengthways and flatten each strip with a meat mallet or rolling pin. Using a 12cm/5in cutter, cut out two circles of steak.
Place the breadcrumbs, parsley, salt and freshly ground black pepper into a blender and process until combined.
Dip the steak into the beaten egg and then into the breadcrumbs.
Heat the olive oil in a frying pan, add the crumbed steak and fry for 2-3 minutes on each side. Remove from the heat and set aside.
To serve, place a slice of tomato onto a serving plate and top with a slice of mozzarella, followed by a slice of beef. Repeat the layers, ending with a slice of beef on top. Garnish with basil leaves and drizzle with olive oil.
