Crab and sweetcorn chowder

Name: Crab and sweetcorn chowder
Ingredients: 1 large onion, peeled and 1/4rd; 2 sticks Celery, cut into chunks; 2 cloves garlic; 200 grams potatoes, peeled and roughly chopped; 1/4 head cauliflower, cut into chunks; 20 grams olive oil; 400g can corn kernels, keep liquid; 500 grams Liquid Chicken Stock; 1 tsp powdered chicken stock/Vegeta; salt and pepper to taste; 1 or 2 can Crab Meat, 1 can gives a subtle flavour. 2 cans is more pronounced.; chopped parsley or chives to serve, optional