(Photo: WMF Singapore) WMF Perfect Plus: Proven technology in a contemporary design I don’t know about you, but I’ve always had a phobia of pressure cookers. When I was little, my mom had a treasured pressure cooker. She used it to do everything: boil, braise, steam and stew. Pressure cookers were really popular in the 80’s and they invaded the homes of many Singaporean aunties back then.