First, fry the onion and the leek together in a little olive oil. Season well. Add the crushed garlic and gently fry until all lovely and soft.
Add the cannellini beans and then add a good glug of boiling water from the kettle. The water will help the beans to go lovely and creamy. Season well and keep stirring, mushing (technical term) a little with your spoon and add more water if necessary until the beans look lovely and creamy.
Meanwhile either in another pan or in a hot oven - cook the cherry tomatoes with the coconut oil and lots of black pepper. You want them slightly blistered but still holding their shape - not mushy.
Sauteé the cavolo Nero and serve all on one plate with a generous amount of parmesan.
Note: 1 can of beans per person is probably a little too much but then 1/2 tin isnt quite enough and I always like to have left overs