Add the flour, salt, water and oil to your food processor, whizz briefly until combined, it should hold together when you press it together with your fingers
Bring together into a ball and knead gently for a few minutes until pliable.
Divide the pasta dough into 4 balls and roll out
Pass each piece through your pasta machine on the widest setting, fold it in half and repeat until you have a neat rectangle
Pass each piece though each setting until you get to the final setting - my machine makes very thin pasta on the final setting so I stopped at the penultimate setting instead!
Cut the pasta into rectangles (size is up to you - delicate parcels or generous pillows!)
Place a tsp (or more if you've got pillows) of filling into the centre and fold it in half
Flatten around the filling carefully to remove any air and seal the edges by pressing together with a fork
Lightly dust a plate/work surface with flour and leave your ravioli while you cook your mushrooms