What are Leeky Beans?

Slow cooked leeks, creamy white beans - cannellini, butter beans, navy perhaps great northern teamed with punchy aromatics like garlic, mustard and of course a squeeze of lemon delivers a wholesome eating experience worthy of the weekly favourite title. Why does this simple pairing work? It's all about the mild sweetness of leeks letting a tin of earthy beans shine rather than overpower them like strong, pungent onion would.