Danish stegt flæsk med persillesovs (grilled pork belly with parsley sauce)

Name: Danish stegt flæsk med persillesovs (grilled pork belly with parsley sauce)
Cook time: 2 h
Total time: 2 h
Cuisine: European
Ingredients: 800g-1kg pork belly, at room temperature (see recipe tip for super-crispy crackling); 1/2 lemon; 1 teaspoon flaky sea salt; 800 gram evenly sized baby new potatoes; pickled vegetables and/or sauerkraut, to serve; steamed green vegetables and/or roasted parsnip, to serve; Parsley sauce; 25 gram butter; 3 tablespoon flour; 1 cup milk; 1/2 cup finely shredded curly or flat-leaf parsley, plus extra to serve; 1/4 cup cream or milk; pinch freshly grated or ground nutmeg