Spiced Fennel and Cabbage with Tomato and Curry Leaves

Name: Spiced Fennel and Cabbage with Tomato and Curry Leaves
Ingredients: 1 large fennel bulb, stalks and fronds removed; 1 large spanish onion; 2 cups shredded green cabbage; olive oil; 2 teaspoons black mustard seeds; 1 teaspoon cumin seeds; 1/2 teaspoon fennel seeds; large pinch red pepper flakes; 10-12 fresh curry leaves; 1 tablespoon minced ginger root; 3 fat cloves garlic, minced; 1/2 teaspoon turmeric powder; 2 teaspoons ground coriander; salt; 15-20 cherry tomatoes, halved; fresh lemon juice