Often relegated to bit parts in appetizer sections, salads enjoy a starring role at Stephi’s. This third outpost of the Stephanie’s on Newbury empire has clearly hit its sweet spot with enormous, attractive, protein-laden entrees, like a pile of mandolined crunchy vegetables topped with grilled shrimp. They’re a boon for locals looking for a healthy but satisfying dinner, perhaps after a session at the nearby Handle Bar or South Boston Yoga. It’s a wonder more restaurants don’t follow suit.