At Tandul, butter chicken is served as a proper curry, built around chicken in a creamy tomato gravy with the restaurant’s spice profile layered in. This style usually relies on a balanced sauce, where dairy and tomato soften the heat and leave the chicken tender and well-coated. It should arrive as a comforting, spoonable dish that works especially well with naan and rice. The evidence here is limited to the menu listing, but it still confirms a real butter chicken offering in Tremont.