Red cabbage, Edam and walnut salad

Ingredients

• 1 small celeriac (peeled and cut into eighths)
• 1/2 lemon (juiced)
• 1 small red cabbage (core removed, then quartered)
• 1 red onion (thinly sliced)
• 1/3 cup walnuts (chopped)
• 100 g Edam cheese
• 1 crisp red apple
• 1 1/2 tbsp walnut oil
• 1 tbsp canola oil
• 2 tsp balsamic vinegar