Fry the mince in the oil for a few mins. Tip
in the tomatoes and herbs. Fill one of the
empty cans with water, add this to the beef,
then bring to the boil. Simmer for 20 mins.
Tip half the spinach into a colander and
pour over boiling water to wilt, then repeat
with the second half. Squeeze out as much
moisture from the spinach as you can, then
leave to drain in the colander. When the beef
is almost ready, cook the gnocchi, then drain.
Heat the grill to high.
Stir the gnocchi and spinach into the beef,
season, then tip into a large ovenproof dish.
Tear the mozzarella into chunks, scatter over,
then grill until golden and bubbling.