Grease and flour 9x5 loaf pan. (Use a bigger one if you have it!)

Combine cake mix, milk, eggs and butter and slowly beat until incorporated.

Mix on medium speed for 2 minutes.

Transfer about 1/3 of batter to another bowl. To that bowl, add the raspberry spread and mix well. Add food coloring if using. Mix well.

To the other "white" bowl, add the lemon juice and mix.

In the loaf pan, add a layer of the white batter. Maybe 1/3 - 1/2 of it.

Add a layer of the red batter.

Alternate red & white layers until batters are gone.

Bake 55-60 minutes at 350 degrees.