I love radish. Best grown in cool weather as crops grown in the heat of summer can be very spicy with woody flesh.
Plant radish seed about an inch apart in the early spring or mid-late summer. I thin mine as they develop their roots so I don’t waste them, harvesting the largest ones first, or every other one if they are of equal size.
I also enjoy leaving some in the ground for the summer after a spring planting. If you let radish go to seed they will produce these beautiful seed pods that are delicious when cooked up into a stir fry.