Sauerkraut (350g)

Sauerkraut is fermented cabbage which  contains many nutrients important for optimal health. One cup (142 grams) provides (2Trusted Source):

Calories: 27
Fat: 0 grams
Carbs: 6 grams
Fiber: 4 grams
Protein: 1 gram
Sodium: 41% of the Daily Value (DV)
Vitamin C: 23% of the DV
Vitamin K1: 15% of the DV
Iron: 12% of the DV
Manganese: 9% of the DV
Vitamin B6: 11% of the DV
Folate: 9% of the DV
Copper: 15% of the DV
Potassium: 5% of the DV

Sauerkraut is particularly nutritious because it undergoes fermentation, a process during which microorganisms on the cabbage digest its natural sugars and convert them into carbon dioxide and organic acids.

(www.healthline.com)