'always required for Christmas cooking' food coloring
incredibly late and gay, but you can make your own food colouring for no extra cost when you cook.
If you're using your oven anyway, put a pan full of veggie ends that you are already cooking with in your stuffing/under your roast/whatever. Let them char and caramelize and add some (not much) water to the bottom of the pan during the cook. If you're feeling saucy, red wine instead of water.
This is similar to when you deglaze your pan after cooking steak but on a larger scale.
Other shortcuts to natural colouration is a bit of tomato paste. Not enough to "tomatofy" your dish, just a teaspoon full or two depending on the amount of food being made. Or soy sauce, especially if you can get your hands on
dark soy sauce. A little goes an incredibly long way and dark soy isn't as salty tasting compared to regular soy sauce.
Another tip for those with room in their freezer - shred your own cheese.
Occasionally Lidl will sell 1kg blocks of cheddar and what I do is I chop said block into smaller blocks of cheese, then throw into my kitchenaid. You can hand grate it, it'll only take longer and require more physical labour from you but it's worth it. Freeze the shredded cheese into smaller amounts that fit your household - when you need it, it can be used frozen (break it up with a meat tenderizer/rolling pin/your fingers) or thawed up in your fridge slowly.
You
can freeze cheese blocks and grate them once thawed, it's the same result but the cheese might act strangely with no consequence to the flavour, it's just not "suitable" for slices of cheese anymore.
I'm not sure what the cost of cheese is in your area of the world but I save a lot of dosh, and reduce my waste, by doing this.