850g Brussels sprouts, trimmed and halved
25g Lurpak® Slightly Salted butter
1 tbsp plain flour
500ml whole milk
125g Gruyère cheese, grated
6 rashers sliced pancetta
3 sliced shallots
1 clove garlic, crushed
3 sprigs of lemon thyme, leaves only, plus extra to garnish
Zest of 1 unwaxed lemon, plus extra to garnish
Pinch of nutmeg, freshly grated
25g breadcrumbs
Pinch of sea salt
Good grind of pepper