Bulk Flour: White Chia, Milled Pumpkin, Sunflower Seed, Watermelon Flours Available – Onset Worldwide – Onset Worldwide | Sunflower Seed Flour | Onset Worldwide produces flours using the Nitro Milling system, a technique developed to mill white chia seed, watermelon, and other hard to mill products. Our bulk flour products include milled sunflower flour, milled pumpkin flour, and more.