A couple of random opinions:
JUMBO/Nacional has the absolute best freshly squeezed orange juice. Usually found in the deli section. I'm not sure where their oranges come from, but every time I drink that juice I close my eyes and I'm back home in Florida where my mother used to squeeze it fresh oranges from a tree in our back yard.
When they have them, JUMBO's ribs are just as good if not better than roadside lechon places. Their roasted chickens aren't bad either.
Before COVID they used to prepare a huge pot of Paella every Sunday; Now they hardly ever have it.
The roast chicken at PROVOCON with wasakaka is some of the best I've had. Gotta make sure you buy it early before they roast the living daylights out of it. The PROVOCON in Haina has a buffet every day and almost everything they have is delicious.
BRAVO has the best freshly baked brownies from a bakery called BOCADO Gourmet. They have them with and without walnuts. Betcha can't eat just one. Check the dates so you get the freshest ones. Super good, easily the best I've had on the island.
I can't convince Sirena to stock Cottage Cheese. JUMBO has it occasionally, but the only go-to place for sure is Pricesmart.