Broccoli, Cauliflower and Halloumi Fritters

• 200 g broccoli, cut into small florets
• 300 g cauliflower, cut into small florets
• 1 cup plain flour
• 1 tsp baking powder
• 1 egg
• 1 cup milk
• 225 g haloumi, finely diced
• 1 lemon
• 100 g rocket
• 1 avocado, cubed
• 2 tbsp extra virgin olive oil