In the winter I buy a lot of frozen veg and find its how you cook it that counts. Green beans, sprouts and broad beans benefit from a quick steam around 3 mins then finish in a little butter in a hot pan to get rid of excess water. Spinach I only ever use frozen -put in pan with tiny amount of water, once defrosted put in sieve and squeeze out as much water as possible, then finish with a little cream or butter. I use frozen casserole mix and frozen mediterranean veg for lasagnes and other dishes. Frozen chopped peppers and onions are ideal for quickness. Veg I've tried and doesn't seem to work: Cauliflower,broccoli,carrots (other than in a casserole) and that vile mixed veg that reminds me of School dinners.