For the ham croissants, peel the onion and garlic. Finely chop onion, garlic and ham. Heat olive oil, lightly sweat onion and garlic, add ham, let steam a little.
Cool, season with crème fraîche and spices. Roll out puff pastry. Cut dough into 20 even, long triangles. Spread the filling on the triangles.
Roll up starting with the wide edge and place on a baking tray lined with baking paper, brush with milk. Preheat oven to 190 °C convection oven.
Bake the croissants for about 15-20 minutes until golden brown.