Spinach and Cauliflower Bhaji
¼ cup vegetable oil2 large onions, coarsely chopped1 head cauliflower, cut into florets2 cloves garlic, crushed1 (2cm) piece fresh ginger, peeled and chopped2 teaspoons ground coriander1 teaspoon ground cumin1 teaspoon ground turmeric1 ¼ teaspoons cayenne pepper1 tin diced tomatoes1 ¼...