Mexican salad with tortilla croutons

Name: Mexican salad with tortilla croutons
Prep time: 10 min
Cook time: 12 min
Total time: 22 min
Cuisine: Mexican
Ingredients: 3 flour tortillas , cut into crouton-sized pieces; 1 tbsp olive oil; 1 tsp Cajun or Mexican seasoning mix; 1 iceberg lettuce , shredded; 400g can black bean , rinsed and drained; 200g pack cherry tomato , halved; 2 avocados , stoned, peeled and sliced; juice 1 lime; ½ bunch coriander , leaves only