Iron-Rich foods!

Hey! So, a blood drive is coming up at school, and I always like to double up on iron a couple weeks before. I have been up and down with my my heme levels. The first time I tried to donate, they said I was anemic and to eat more iron-rich foods. Other than red meat (which I don't really like that much), what other foods are super high in iron? I've heard spinach. Anyone have some surprising iron-rich foods?