It looks like red russian kale,is big enogh so you can cook with it delish in soups,pastas,stir fried,etc...

looks like kale to me too

Looks like a collard or Kale to me.

Thank you! I've been eating it in salads, but now I can try cooking it.

Definitely Red Russian kale. Pick it aggressively and it will keep spewing out leaves until it decides to bloom. The little flower buds are edible, like broccolini.

And once it blooms leave it to seed and you will have red Russian kale for years to come. I love this stuff. No effort and delicious greens. Just wash it, shake off the water. Melt a tiny bit of butter in a pan. Put in the greens with only the water that it clinging to the leaves. Put on the lid and cook over a medium heat. They will steam in the little bit of liquid and will be yummy. Oh - and one more thing. It really cooks down, like spinach, so put in a good big handful per person.