Chef Paul Mattison has used the humanely raised, sustainable meat produced by Niman Ranch for years. Through the end of this month, he's showcasing the company's products even more, with an online sweepstakes and photo contest.

Prizes include gift baskets stuffed with Niman Ranch products, gift cards to Mattison's three restaurants, Motorworks Brewing products, wine and other types of swag. You can enter to win online by clicking here. (Every entrant will receive a $10 gift card to use at any Mattison's restaurant.)

For more prizes, you can order a dish featuring a Niman Ranch product from Mattison's, snap a photo of it and post it on Mattison's Facebook or Instagram page with the hashtags #NimanRanch and #Mattisons.

Founded in California in the 1970s, Niman Ranch works with a network of more than 740 family farmers and ranchers in 22 states, each of whom follows specific Niman Ranch rules for raising high-quality beef, pork and lamb.