Chicken, Feta and Spinach Sausage Rolls - The Road to Loving My Thermo Mixer

Name: Chicken, Feta and Spinach Sausage Rolls - The Road to Loving My Thermo Mixer
Cuisine: European, Greek, Mediterranean
Ingredients: 1 garlic clove, peeled; 1 small onion, peeled and quartered; 500g chicken mince; 20g baby spinach leaves; 100g feta cheese; pinch of pepper, freshly cracked; 3 sheets of puff pastry, thawed (or make your own with the Iced Puff Pastry recipe in the Easter Subscriber-Only Bonus Issue); 1 egg, beaten (can omit or replace with milk for EF); sesame seeds, for topping