What is "kinnow"

The kinnow is a high yield mandarin hybrid cultivated extensively in the wider Punjab region of India and Pakistan.

It is a hybrid of two citrus cultivars — 'King' ( Citrus nobilis) × 'Willow Leaf' ( Citrus × deliciosa) — first developed by Howard B. Frost at the University of California Citrus Experiment Station. After evaluation, the kinnow was released as a new citrus hybrid for commercial cultivation in 1935.