Bring a medium pot filled halfway with water to a rolling boil over high heat. Add the sea salt and stir until all the salt is dissolved. The water should taste similar to ocean water.
French the beans, removing the strings on both sides with a paring knife. Add the green beans to the water and cook until tender, about 3 minutes.
Drain the green beans and add to a large bowl filled with cold water and ice cubes to stop the cooking process. When the green beans are cool remove the green beans from the ice and drain again. Refrigerate until ready to serve.
When ready, heat olive oil in a sauté pan over medium heat. When the oil is hot, add the garlic and sauté until fragrant, about 30 seconds. Add the green beans and sauté for 2 minutes, stirring occasionally. Season with lemon juice, salt and pepper.