Step 1
Preheat oven to 200°C/180°C fan-forced. Line a baking tray with baking paper.
Step 2
Place wombok on prepared tray. Whisk oil and soy sauce together. Drizzle over wombok. Roast for 15 to 20 minutes or until golden and tender, sprinkling with garlic and 1/2 the sesame seeds halfway through cooking.
Step 3
Whisk mayonnaise, tahini, vinegar, 1 tablespoon water and remaining sesame seeds in a bowl until smooth and combined. Drizzle over cabbage. Sprinkle with green onion. Season with salt and pepper. Serve.