1. Cut off tops of artichokes to within 1 or 1 1/2 inches from the bases. Remove all but 1/2 inch of stems. Cut all around artichokes, removing all hard parts. Open centers; dig out chokes. Trim any remaining hard parts, leaving the artichoke bottoms.

2. Heat 1/4 cup oil in a deep, large saute pan set over medium-high heat. Add the onion, and saute until it begins to soften, 2 to 3 minutes. Lay artichoke bottoms on top of onion, then pour in wine.

3. Bring liquid to a boil, reduce heat to low, and cover. Simmer, turning the artichokes after 15 minutes, until bottoms are tender but not mushy, 30 to 45 minutes.

4. Remove cooked artichokes, reserving 3/4 cup cooking liquid in pan. Cut artichokes into bite-size chunks; return to pan. Add the remaining tablespoon oil and lemon juice. Season with salt and pepper. Turn heat to very low, keeping artichokes warm.

5. Season the shrimp with salt and a sprinkling of cayenne pepper. Heat a large nonstick saute pan over medium-high heat for 1 minute. Add the butter.

6. Dredge one side of each piece of shrimp in the orange dust; place in pan. Cook until lightly browned, about 2 minutes; turn, and cook 2 to 3 minutes more.

7. When ready to serve, divide arugula among four plates. Top each with a portion of the artichokes and 6 shrimp; pour the artichoke liquid over tops; garnish with basil. Sprinkle a little orange dust around the outside of each plate, and serve.