Preheat oven to 200°F fan
Blitz together soft butter, cracked black pepper, maple syrup, anchovies with their oil, Dijon mustard, and garlic cloves until smooth
Taste the marinade and adjust seasoning - add more mustard if too sweet, or more anchovies if not salty enough
In an oven-proof skillet, heat a drizzle of olive oil on medium to high heat
Drizzle olive oil over the cabbage wedges and lightly salt them with flaky salt
When the pan is hot, sear the cabbages on each flat side until dark golden brown, about 5 minutes per side, being careful not to burn them
Flip the cabbages over and brush the butter marinade all over them
Generously grate Parmesan cheese over the cabbages
Place the skillet in the oven and roast for 20 to 30 minutes or until fork tender, depending on cabbage size
Remove from oven, grate additional Parmesan cheese over the top, and serve on a platter
