In a large mixing bowl, combine all-purpose flour, sugar, yeast, and salt. Gradually pour in about 1 cup of warm water while mixing until a shaggy dough forms. Knead for 8-10 minutes.

Place the dough in a greased bowl, cover with a towel and let rise in a warm spot for 1-2 hours, or until doubled in size.

After rising, punch down the dough, divide it in half, and knead in black food coloring to one half and red food coloring to the other until colors are vibrant.

On a floured surface, roll out black dough into a rectangle, then layer the red dough on top. Twist together to form a loaf and pinch the ends.

Place the twisted loaf into a greased loaf pan, cover with a towel and let rise for another 30 minutes.

Preheat oven to 350°F (175°C). Bake for approximately 30 minutes until golden brown.

Remove the loaf from the oven and place onto a wire rack. Allow to cool for 10-15 minutes before slicing.