1 pound small waxy potatoes, for example Yukon gold, fingerling, Yellow Finn
fine sea salt
1 1/2 tablespoons unsalted butter, plus more for the baking dish
2 medium leeks, trimmed, thinly sliced, well washed
3 garlic gloves, minced
1/2 medium head of cabbage (about 1 lb / 16 oz / 450g), cored and shredded
1/2 cup / 120 ml vegetable broth or water
1 1/2 tablespoons whole grain mustard
1 1/2 cups freshly grated Parmesan cheese
16 fresh sage leaves
12 ounces / 340 g dried farro tagliatelle, broken into 3-inch segments
4 ounces soft-rind, creamy cheese, cut into tiny cubes (for example, I used this Ardrahan farmhouse cheese, but Stracchino, fontina, or tallegio could all work too)
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