Spinach

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Its soft leaves work well as salad greens or can be cooked down to concentrate its flavor.

Nutrition highlights:
Per 100g serving, there are 23 calories, 2g of net carbohydrates (4g of carbohydrates and 2g of fiber), and 3g of protein. Spinach is an excellent source of vitamins K and A.

Easy ways to enjoy:
1) Toss raw spinach with apple slices, walnuts, and your favorite dressing.
2) Saute garlic in olive oil, add spinach, and cook until tender.
3) Add to soups, pastas, and omelettes.

Reference:
https://fdc.nal.usda.gov/fdc-app.html#/food-details/787373/nutrients