Method:
For dip, heat 2 tablespoons olive oil in a sauté pan over medium heat. Add onion and cook, stirring occasionally, until softened and translucent, 8 to 10 minutes. Stir in garlic, parsley and rosemary and cook until fragrant, about 2 minutes. Stir in edamame, followed by stock. Cook until beans are tender and liquid has reduced considerably, 8 to 10 minutes. Let cool slightly.
Pour edamame mixture into a blender. Take care as the ingredients are hot - keep your hand over the blender lid. Purée ingredients, gradually pouring in remaining half cup of olive oil. When completely puréed, add salt and pepper.
Pour dip into a serving bowl. Cover and chill until ready to serve.
For garlic crostini, preheat oven to 400°F. Slice baguette into 1/4-inch-thick slices. Rub both sides of each slice with garlic. Brush each slice with olive oil and sprinkle with salt. Bake crostini for 12 to 15 minutes until they are light brown and crisp. Serve at room temperature with dip.