Core and shred the cabbage. Finely slice the onion.
Heat the oil in a pan then cook the onion for 5 minutes. Add the cabbage and thyme, put a lid on then turn down the heat and gently sauté for 5 minutes. Add the vinegar and cook for another 5-10 minutes (covered) until al dente.
Meanwhile toast the walnuts (if used) in a frying pan for 3-4 minutes and set aside.
When the cabbage is cooked but still crunchy, season with salt and pepper and crumble the walnuts on top. Add some maple syrup to your liking and toss.
Transfer to a serving plate and scatter the cheese on top. Drizzle with a drop of maple syrup and garnish with some more walnuts.