DS has come to live back home after university - he is also a very new vegan. He is a keen cook and so far has produced beautiful meals for the 2 of us. However, most seem to contain exotic and expensive ingredients. He also drinks vast quantities of milk substitutes. Overall, my shopping bill has gone through the roof (he is job hunting, so is not contributing financially at present).
The cheap meals we have had are lentil shepherds pie, chickpea and butternut squash curry, lentil bolognes, tofu stirfry. I am not a vegan or a vegetarian, but am happy to go with the flow provided we can cut the costs.