This is my first Le Creuset enameled cookware, purchased just 2 days back from amazon. I bought it after getting rid of all my teflon coated cookware, having read some reviews of this being a good alternative. I cooked ground turkey in it, using a generous quantity of olive oil at medium heat. It was sticking a little; after washing, I noticed the enamel had worn off, exposing the cast iron surface and ugly spots all over. I had used wooden utensils, did not cook on high and had cleaned with a soft sponge. Not sure if this is normal or if the item is defective.. Is there anything I could do to season the surface ? Please advise.