A beverage brewing cartridge includes a base and a plug. The base includes a sidewall, a fillable end having an opening, and a closed end. The plug is configured to close off the opening. A method of constructing a brewing cartridge includes placing the base of the beverage brewing cartridge on a cartridge seat of a cartridge tool with the closed end against the cartridge seat. A cartridge lock retains the base against the cartridge tool. A portion of brewing material is scooped and poured into the base through a mouth of the cartridge lock and the opening of the fillable end of the base, and then tamped into the base. The plug is positioned above and aligned with the opening of the fillable end of the base, and seated into the opening to close the opening, thereby completing construction of the brewing cartridge.