Bring stock to a simmer in a saucepan. Heat the olive oil in a large saucepan over medium heat and sweat the onion and garlic until softened but not colored. Raise the heat to high add the wine, and reduce until dry. Reduce the heat, add the rice and saffron and stir until the rice is coated with the oil. Cook 2 minutes.
Add 1 cup of the stock and cook, stirring, until absorbed. Repeat with a second cup. As the rice becomes dry, add stock in 1/2 cup increments, cooking and stirring until it is absorbed. Add the honey and tarragon and season to taste with salt and pepper.
Green Onion Vinaigrette: Blanch the scallions for 30 seconds in a large pot of boiling salted water over high heat. Drain and shock in cold water.
Combine the scallions, onion, garlic, and vinegar in a blender and process until pureed. With the motor running, slowly add the oil until emulsified. Add the honey, season to taste with salt and pepper and pour into a squeeze bottle.
Grilled Shrimp: Heat the oil in a large saute pan over high heat. Season the shrimp with salt and pepper to taste. Saute 2 to 3 minutes on each side. Spoon risotto into large serving bowl, arrange shrimp on top.