Combine tomatoes, 4 Tbsp. of the oil, parsley, lemon zest and juice, honey, fennel seed, 1/2 tsp. of the salt, and 1/4 tsp. of the black pepper in a bowl. (if desired, for a kick of heat, stir in 1/4 tsp. crushed red pepper flakes). Set side.
Heat remaining 1 Tbsp. oil in small saucepan over medium heat. Add garlic and 1/4 tsp. of the salt; cook 2 minutes, until aromatic. Pour in broth and bring to a boil. Stir in couscous; cover. Remove from heat; let stand 5 minutes. Fluff with a fork.
Melt butter in a large saute pan over medium-high. Season shrimp with remaining 1/4 tsp. salt and 1/4 tsp. black pepper, and, working in batches if needed, add shrimp to pan; cook, turning once, until lightly charred around the edges, about 1 to 2 minutes per side.
Divide couscous evenly among 4 bowls or plates. Scatter shrimp and residual butter in pan evenly over couscous. Spoon tomato-fennel seed mixture evenly overtop.