A premixed dual fuel burner for a combustion chamber of a turbomachine, the premixed dual fuel burner comprising: - a burner head having a burner head end , - a burner interior elongated along a main axis and having an upstream side and a downstream side , wherein the upstream side is disposed between the burner head and the downstream side and wherein the upstream side is fluidly connected to the downstream side , - a swirler enclosing the upstream side of the burner interior and comprising an inlet section configured to introduce air and a main gas fuel into the burner interior , - a premixing section enclosing the downstream side of the burner interior , wherein the swirler is arranged between the burner head and the premixing section , and wherein the premixing section comprises a burner outlet configured to be arranged with the combustion chamber such that the downstream side is fluidly connected to the combustion chamber , and - an injection component positioned along the main axis and extending from the burner head into the burner interior , the injection component having a burner head side and an injection side and wherein the injection component tapers from the burner head side to the injection side along the main axis , wherein the injection component comprises at least one liquid fuel outlet at the injection side and the injection component is configured to introduce a main liquid fuel into the burner interior through the at least one liquid fuel outlet and wherein the injection side of the injection component is disposed in the burner interior , and wherein at least one of the at least one liquid fuel outlet is at a side of the injection side of the injection component , characterized in that the injection component has a tapering structure and its radial width reduces over an axial distance D by only or less than D/10. - a burner head having a burner head end , - a burner interior elongated along a main axis and having an upstream side and a downstream side , wherein the upstream side is disposed between the burner head and the downstream side and wherein the upstream side is fluidly connected to the downstream side , - a swirler enclosing the upstream side of the burner interior and comprising an inlet section configured to introduce air and a main gas fuel into the burner interior , - a premixing section enclosing the downstream side of the burner interior , wherein the swirler is arranged between the burner head and the premixing section , and wherein the premixing section comprises a burner outlet configured to be arranged with the combustion chamber such that the downstream side is fluidly connected to the combustion chamber , and - an injection component positioned along the main axis and extending from the burner head into the burner interior , the injection component having a burner head side and an injection side and wherein the injection component tapers from the burner head side to the injection side along the main axis , wherein the injection component comprises at least one liquid fuel outlet at the injection side and the injection component is configured to introduce a main liquid fuel into the burner interior through the at least one liquid fuel outlet and wherein the injection side of the injection component is disposed in the burner interior , and wherein at least one of the at least one liquid fuel outlet is at a side of the injection side of the injection component , characterized in that the injection component has a tapering structure and its radial width reduces over an axial distance D by only or less than D/10. <EOS>