Preheat oven to 425 degrees.
Wash haricots verts and pat them dry. Add to a medium size bowl.
Peel six cloves of garlic and slice or chop into small pieces. Add to the bowl.
Grate one lemon, reserve ½ to ¼ teaspoon, and add the rest of the grated lemon to the bowl. Add salt, sugar, and some ground black pepper. Mix well to coat all the ingredients with the olive oil.
Spread green beans on a baking pan, and add slices from one half of the lemon. Cook for about 10 minutes, then stir the green beans. Cook about 5 to 10 minutes longer, allowing the haricots verts to brown but not burn.
To serve, transfer to a serving platter using tongs. Top with the juice from the other half of the lemon and the remaining lemon zest.