Learn to cook.
When you rarely cook and don’t know how, it seems like cooking is much more expensive than going out. You have to buy all those ingredients you never use again and there is a pretty good likelihood that what you cook won’t taste as good as what you could have ordered. But if you start to cook regularly (and don’t cook from one of those cookbooks with 42 rare ingredients and 21 separate steps) you will most likely find that cooking is much cheaper than what you can order and plus you can have it your way. Plus, cooking can fulfill your sense of adventure. Start small, but start cooking.