To make the orange cups, cut blossom end from orange about 1/3 — 1/2 the distance from the top. (bonappetit.com)
That's what's happened to me this year, with all my toms getting a serious case of blossom end rot. (treehugger.com)
While many online resources on blossom end rot point out that it is a calcium deficiency, and suggest mixing powdered milk into the soil when you plant, the video above echoes advice I received at the farmers market — the culprit is most likely inconsistent water supply. (treehugger.com)