Yellow Corkscrew Vine - Vigna angularis
This sweet yellow bloomer is rarely seen outside Asia, where it's grown for its edible beans. It's as easy to grow as any garden pea and the bloom is a real surprise.
Yellow Snail Vine makes a lovely ornamental, with bright yellow, twisty pea-like blooms. Only 2' tall, it needs full sun, regular water, and something to climb on. Any soil is fine. Like all legumes, it will add nitrogen as it grows.
Azuki beans make terrific sprouts, and if you love Asian cuisine, you know all the sweet confections they're used in. But the flowers are more than enough.