Swedish Gravlax with Rocket and Mustard

Ingredients

• 1 head cauliflower
• 1 bunch kale
• ¼ small red onion
• 50 g feta cheese
• 1 large lemon
• 1 tsp dijon mustard
• 1 tsp honey
• 1 clove garlic
• ¼ tsp salt
• ¼ tsp pepper
• 3 tbsp olive oil