Darling International (DAR 4.94%) already stands tall as the nation's largest publicly traded rendering company, but Darling currently boasts another significant catalyst now that its two-years-in-the-making joint biodiesel venture with Valero (VLO 0.08%) is finally up and running, says Fool contributor Steve Symington in the following interview with the Fool's Alison Southwick.

Dubbed Diamond Green Diesel, the plant will be able to produce nearly two-thirds the number of gallons of biodiesel as the combined total of all seven of the plants owned by the United States' current biodiesel leader, Renewable Energy Group (REGI).

But what do you think? Does the new Diamond Green Diesel operation make Darling International a buy? Watch the video to get Steve's full take, and then weigh in using the comments section below.