I consider this a new find, in the same category as Sophia's Grotto in Roslindale. A mix of Mediterranean and Peruvian food. The've been open just three months, and were fairly crowded on a Sunday night.
My husband had the black bean soup: earthy, just the right thickness, and full of flavor. He followed that with very tasty duck (crisp and moist at the same time) in a fruity sauce. My son had papa rellenos-lamb: a mixture of ground lamb, potatoes and peas, then sauteed til they became soft log-like pieces. Again, superb flavor. His main dish was halibut in a clam broth, with some clams strewn around the dish. Quite perfecly done. I had baked acorn squash with mushroom ragu. An impressive mixture of wild mushrooms that made for a perfect autumn selection. Pot de creme for dessert. Very nicely presented with swirls of raspberry and chocolate sauces on the plate. They offer wine and beer. Most apps are in the $5-$8 range, except for the seviche, which was $19 (shrimp, octopus and, I think she said, swordfish). Entrees are between $18 and $27. Service was neighborhood-friendly. The very helpful server took me on little tour of the upstairs: attractive bar and more seating. She indicated that they may be expanding to the empty store next to them.
Masona has a warm feel, with earthy colors, beautiful wood floors and pleasing artwork. We left knowing that we will look forward to returning.