A frozen dough-based vase-shaped snack heatable by microwave, comprising: a cone or cylindrical-shaped dough-based outer layer made of dough having a closed lower portion and a rim upper portion around an open top; and a savoury or sweet filling located within said outer layer and having a top surface exposed at said open top of the outer layer; wherein both the outer layer and the filling are in a frozen state, at the time they are re-heated by means of microwaves characterized in that: the filling comprises an open hollow core having inner surfaces open at said top surface of the filling, said hollow core allowing for the microwaves to propagate through the hollow core and irradiate the filling from said inner surfaces of the hollow core; wherein the hollow core is configured such that a ring of filling is provided between the outer layer and the hollow core; wherein said ring of filling has a thickness equal or less than four times the penetration depth (Dp) of the microwave electric field |E|; and wherein the hollow core extends into the filling to a depth whereby a thickness of the filling in the closed lower portion of the outer layer does not exceed four times the penetration depth (Dp), wherein the penetration depth being defined as the distance travelled by the microwave before the amplitude of the microwave electric field |E| is reduced to 1/e of its value at the start point. a cone or cylindrical-shaped dough-based outer layer made of dough having a closed lower portion and a rim upper portion around an open top; and a savoury or sweet filling located within said outer layer and having a top surface exposed at said open top of the outer layer; wherein both the outer layer and the filling are in a frozen state, at the time they are re-heated by means of microwaves characterized in that: the filling comprises an open hollow core having inner surfaces open at said top surface of the filling, said hollow core allowing for the microwaves to propagate through the hollow core and irradiate the filling from said inner surfaces of the hollow core; wherein the hollow core is configured such that a ring of filling is provided between the outer layer and the hollow core; wherein said ring of filling has a thickness equal or less than four times the penetration depth (Dp) of the microwave electric field |E|; and wherein the hollow core extends into the filling to a depth whereby a thickness of the filling in the closed lower portion of the outer layer does not exceed four times the penetration depth (Dp), the filling comprises an open hollow core having inner surfaces open at said top surface of the filling, said hollow core allowing for the microwaves to propagate through the hollow core and irradiate the filling from said inner surfaces of the hollow core; wherein the hollow core is configured such that a ring of filling is provided between the outer layer and the hollow core; wherein said ring of filling has a thickness equal or less than four times the penetration depth (Dp) of the microwave electric field |E|; and wherein the hollow core extends into the filling to a depth whereby a thickness of the filling in the closed lower portion of the outer layer does not exceed four times the penetration depth (Dp),