Open source meals.
You can eat pre-prepared food that might be cheap, but who knows what it is about Or you can learn to make your own meals from scratch that might even be more nutritious and more interesting!
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Tofunaise
Use tofu instead of eggs to make mayonnaise. Seemed to be more malleable after sitting in the fridge. 1 pkg Tofu (240g) (Be sure to squeeze any extra water out) 2 tbsp cider or white vinegar 1 1/2 tbsp table mustard 1 tsp honey or sugar (optional) 2 tbsp cooking or olive oil (optional) Salt & pepper to taste Garlic powder (optional) Mix it all up good and fluffy.