If you are not opposed to eating sea food, there are many fish that are good on keto. Mackerels, Sardines, Anchovies, and Salmon come to mind, plus they have a high ratio of omega 3 vs omega 6 and 9. I eat lots of Avacado and use a lot of olive oil you can cook vegetables in. You honestly want to go light on the nuts, because even many of the fatty ones still have quite a few carbs, and the omega fat ratio is not great. Also flax is a big deal. I get what you are saying though; I think it would be difficult to be vegetarian on this diet, though ironically I probably eat less meat than I did before keto.