By Wu Liang-yi and Esme Yeh / Staff reporters A public interest litigation system should promptly be established to assist people in seeking remedies amid a scare over cooking oil, the Consumers’ Foundation said yesterday.Excessive levels of the carcinogen benzopyrene were detected in 1,300 tonnes of soy-based cooking oil produced by Central Union Oil Corp, with three companies — Taisun Enterprise Co, Fwusow Industry Co and Formosa Oilseed Processing Co — producing products using the batch that went onto shelves, the Food and Drug Administration (FDA) said.Eighteen products were affected, including household cooking oil, and bulk 18l and 18kg containers supplied to restaurants, breakfast shops, street vendors, food processing plants and institutional catering providers, the FDA said. A Hsi