c. rhubarb
Rhubarb is very low in calories while providing fiber and vitamin K. It contains oxalic acid, which inhibits calcium absorption, though cooking reduces oxalate bioavailability.
About
Rhubarb (Rheum rhabarbarum) is a perennial herbaceous plant native to Siberia and the Volga region, cultivated worldwide for its thick, fleshy petioles (leaf stalks). The plant produces large, deeply veined leaves atop tall stalks that range in color from pale green to deep crimson, depending on variety and growing conditions. Rhubarb has a distinctly tart, acidic flavor profile dominated by oxalic acid, with subtle fruity undertones. The edible portion is the stalk; the leaves contain toxic concentrations of oxalates and should never be consumed. Common cultivars include 'Victoria,' 'Timperley Early,' and 'Champagne,' each varying slightly in tartness and color intensity.
Culinary Uses
Rhubarb is used primarily in sweet applications, where its acidity is balanced with substantial sugar to create jams, compotes, pies, and desserts. The classic pairing with strawberries—often called "strawberry rhubarb"—leverages the fruit's natural sweetness to temper rhubarb's sourness. Beyond desserts, rhubarb appears in chutneys, sauces, and savory applications in Middle Eastern and Asian cuisines. The stalks are typically diced or sliced before cooking; minimal preparation is required beyond trimming the fibrous base. Rhubarb's high pectin content makes it ideal for preserves and forced rhubarb (pale, tender early-season stalks) is prized for eating raw with sugar.