Wash the beans and slice off both ends. Then slice them in half so they are bite-sized lengths. Finely cube the onions.
1 ½ lb green beans , onion
Place the green beans in a pot with lightly salted boiling water. Cook for about 10-15 minutes until they are cooked but still have some bite to them. Blanch them in cold water so they retain their green colour.
While the beans are cooking, prepare the marinade. Combine the oil, vinegar, salt, sugar (and summer savory if using) and crushed garlic clove into a small bowl and stir.
Toss the still warm beans in the dressing, and add the chopped onions. Cover the salad and place it in the fridge for at least 30 minutes (ideally overnight) for the flavours to absorb.
Before serving, season with salt and pepper to taste. Serve the salad cold.