Cream butter; add cheese and sour cream, beating well at medium speed of an electric mixer. Combine flour and Italian seasoning. Gradually add to creamed mixture, blending until smooth. Turn dough out onto a lightly floured surface; divide in half. Roll out half of dough to a 12x 18 cm rectangle and cut into 6x 1 cm strips. Twist each strip 2 or 3 times, and place on greased baking sheets. Repeat procedure with remaining dough. Combine egg yolk and water. Brush strips with egg mixture; sprinkle with seeds. Bake at 180ºC or 10 to dozen minutes or ----