Have a bowl of ice water. Bring 1 gallon of water to a boil. Add salt to water till you can taste salt approx. ½ cup. Blanch yellow beans first and until tender and then with a strainer pull beans out of water and place in ice water to cool down. Repeat with the green beans. Drain when cool.
Mix water, rice wine vinager, sugar and salt into a pot. Bring to a boil. Pour over the thinly sliced red onion and refridgerate till cool. Can be done a few days in advance.
To serve: Place beans in large bowl. Mix in pickle onions and toss with vinaigrette about 20 mins before serving to marinate. Before serving mix in citrus segments, cheese.