Directions

1. Heat milk in a small saucepan until it reaches 110 degrees. Remove from heat; stir in yeast and 1 1/2 tablespoons sugar until completely dissolved. Let stand until foamy, 10 to 15 minutes.
2. Transfer yeast mixture to a stainless steel bowl. Add 2 cups flour and stir to combine. Spray a piece of parchment paper with cooking spray and cover dough. Cover parchment with a kitchen towel and let rise until doubled in size, 30 minutes to 1 hour.
3. Meanwhile, in the bowl of an electric mixer fitted with the paddle attachment, beat together 1 1/2 sticks butter, 1 1/4 cups sugar, orange zest, eggs, and 2 cups flour.
4. Change mixer attachment to a dough hook and add yeast mixture to mixer bowl. Mix together on low. With the mixer running, slowly add 2 cups flour and raisins. Butter a large bowl and add dough. Spray a piece of parchment paper with cooking spray and cover dough. Let rise until doubled, 1 1/2 to 2 1/2 hours.
5. Meanwhile, in a medium bowl, use a fork to mix together remaining 2 cups flour, 1 stick butter, and 1 cup sugar until crumbly.
6. Butter three 9-by-5-by-3-inch (8-cup) loaf pans and divide dough evenly between them; top each with crumbs. Spray a piece of parchment paper with cooking spray and cover dough; let rise until rounded over the top.
7. Preheat oven to 325 degrees. Transfer placek to oven and bake until golden brown, 35 to 40 minutes. Let cool for 1 hour in pan before removing. Store at room temperature, up to 1 week.