Add the milk (make sure it’s warm but not hot) and the yeast to the starter and mix well. (If you’re using active dry yeast, let the yeast sit in the milk until foamy, about 5 minutes.)
In a large bowl, use a handheld mixer to beat the egg yolks with the sugar until slightly thickened, 3 to 4 minutes.
Fold the milk and yeast mixture into the egg mixture along with the salt. Gradually sift in and mix in the flour – the dough should be firm but bouncy. Cover the dough with a clean kitchen towel and leave to rise in a warm place until doubled in size, 1 to 2 hours.
Moisten your hands with some sunflower oil and knead the dough for about 15 minutes. Scatter the golden raisins on your work surface and knead them into the dough.
Now divide the dough into 4 pieces. Oil four clean tomato cans and half-fill them with the dough. Leave to proof in a warm place until doubled, 45 to 60 minutes.
Meanwhile, preheat the oven to 350°F (180°C).
Place the dough-filled cans on a baking sheet and bake on the lowest rack of the oven until golden brown and cooked through to an internal temperature of 195°F (91°C), 35 to 40 minutes.
Let the breads cool completely in the cans, then run a palette knife (or offset spatula) around the edges to help remove the breads from the cans.