Put your soup back on the hob and simmer until warm. Cut the crust off your bread and cut up into squares. Add 1tsp of oil to the frying pan and add your cubes facing down then leave on a medium heat for 2 minutes. Turn the croutons and do the same for the other side. Add your rosemary to infuse in to the croutons. Put the pan into the oven for 4-5 minutes, be sure to keep an eye on them, you don’t want them to burn.