In a small saucepan, gently heat the milk until warm but not boiling. Remove from heat and sprinkle the dry yeast and 30 g of sugar over the milk. Allow to sit 5-10 minutes until frothy.
In a large mixing bowl, combine the frothy yeast mixture with room-temperature butter, vanilla essence, lemon zest, and eggs. Whisk until well-combined.
In a separate bowl, sift the Manitoba flour. Gradually add the flour to the wet ingredients, mixing until a dough begins to form.
Turn dough onto a lightly floured surface and knead about 10 minutes until smooth and elastic. Alternatively, use a stand mixer with dough hook for 5-7 minutes.
Place kneaded dough in greased bowl, cover with kitchen towel, and let rise in warm area about 1 hour or until doubled in size.
While dough is rising, mix pistachio cream and coarsely chopped white chocolate in a bowl. Set aside.
Punch down risen dough and turn out onto floured surface. Roll into rectangle approx. 12x18 inches.
Spread pistachio and white chocolate mixture evenly over dough, leaving a small border around edges. Sprinkle roasted and salted chopped pistachios on top.
Starting from one long edge, roll dough into a tight log. Pinch seams to seal. Cut log in half lengthwise to reveal filling, twist two halves together. Place twisted log into prepared loaf pan.
Cover loaf pan with towel and let rise again about 30 minutes or until puffed up.
Preheat oven to 180°C (350°F). Bake babka rolls 30-35 minutes until golden brown and cooked through.
While rolls bake, combine 50 g sugar and 50 ml water in small saucepan. Bring to boil, then reduce heat and simmer until sugar dissolves.
Remove rolls from oven and immediately brush warm sugar syrup over top to give beautiful shine.
Allow rolls to cool in pan about 10 minutes before transferring to wire rack. Serve warm or at room temperature.