So as it's super hot at the moment we've been having salads for the last few nights with cold pasta (I could eat this every day!) and I found some beetroot in the cupboard. When I was placing it on the plate, oh so decoratively, might I add and getting my fingers all purple, I had the random idea of putting a few drops of the juice into the pasta and seeing if it would dye that too.
Low and behold, my obsession with pink pasta was born. I later Googled it and this is a big thing.
Once the pasta is cooked and cooled just add a couple of tablespoons of the juice from the jar and add to produce your desired effect. I like it when a bit of the pasta is still the original colour so I just add such a small amount and then swirl it round, but this is up to you. I've seen pictures of full on bright neon looking pasta out there.
I adore onions and we have a batch of red onions in at the moment so I threw almost a full one in, added a tiny bit of chilli salad dressing and some black pepper.