In a saucepan, boil peas in salted water for 30 seconds or until they are bright green. Drain and plunge into cold water. Drain them well.
To toast the sesame seeds place them in a dry frying pan over medium low heat and cook them until they turn a light brown. Watch them very carefully as they can burn easily.
In a large bowl toss together the peas, sliced cucumber and the sliced radishes. Add the rice vinegar and the oils and stir it all together.
Season with salt & pepper to taste. Sprinkle the sesame seeds over the salad and toss to mix together.