Black Bean, Chorizo and Sweet Corn Salad

3 tablespoons olive oil
2 dried chorizo sausages, cut in half lengthwise, thinly sliced on the diagonal
1 large red onion, thinly sliced
2 cloves garlic, crushed
1 teaspoon cumin seeds
1 teaspoon ground turmeric
1 x 400 gram tin whole sweetcorn kernels
2 zucchini, finely diced
1 large vine tomato, diced
1⁄2 red capsicum, diced
1 carrot, peeled and diced
1 x 400 gram tin black beans, rinsed and drained (we used Ceres)
1⁄4 cup roasted sunflower or pumpkin seeds
1⁄2 cup chopped soft herbs, any combination of flat-leaf parsley, mint, basil, chives, dill

Dressing
4 tablespoons olive oil
2 teaspoons Dijon mustard
finely grated zest and juice 1 large lime
2 cloves garlic, crushed
small handful fresh mint
sea salt and freshly ground pepper