Spicy corn, black bean & feta salad

Name: Spicy corn, black bean & feta salad
Prep time: 20 min
Cook time: 10 min
Total time: 30 min
Cuisine: American
Ingredients: 2 sweetcorn; 400g can black beans drained and rinsed; 1 avocado cut into chunks; 200g cherry tomatoes halved; 4 spring onions roughly chopped; 100g feta cheese crumbled; lime wedges, to serve (optional); 1 tsp ground cumin; 1 tbsp chipotle Tabasco sauce (use regular Tabasco if you can't find this); juice and zest 2 limes; 1 tbsp sherry vinegar; 2 tbsp extra-virgin olive oil