Dulce de leche brioche rolls

Place warm water, warm milk, and yeast in a bowl of standing heavy-duty mixer - I don’t own one so I used my old and not so heavy standing mixer, with the beaters that look like springs - stir until yeast dissolves. Fit mixer with dough hook. Add flour and salt to bowl; mix on low speed just until flour is moistened, about 10 seconds. Scrape sides and bottom of bowl. Beat in 3 eggs on low speed, then add sugar. Increase speed to medium and beat until dough comes together, about 3 minutes. Reduce speed to low. Add butter, 1 piece at a time, beating until each piece is almost incorporated before adding next (dough will be soft and batter-like). Increase speed to medium-high and beat until dough pulls away from sides of bowl, about 7 minutes. Cover bowl with plastic wrap. Let dough rise at room temperature until almost doubled in volume, about 1 hour. Lift up dough around edges and allow dough to fall and deflate in bowl. Cover bowl with plastic and chill until dough stops rising, lifting up dough around edges and allowing dough to fall and deflate in bowl every 30 minutes, about 2 hours total. Cover bowl with plastic and refrigerate an hour. Take the dough out of the fridge and divide in half. For the buns: roll out the dough to a 35x22cm (14x9in) rectangle. Spread the dulce de leche leaving a 2.5cm (1in) border. Roll into a log and cut into 12 pieces. Place them in a buttered 22.5cm (9in) round pan, cover and refrigerate until the next morning. The dough will rise slowly overnight.* In the morning, bake at 175°C/350°F for 20-25 minutes. You can repeat with the other half or make a brioche loaf.