Combine flour, 1 tbsp. sugar and 1 pinch of salt.
Remove butter (150 g) from the refrigerator. Cut into small cubes.
Add it to the dry ingredients. Blend until crumbly or chop with a knife, then rub with your hands.
Add cold water. Knead until the dough is firm. If you don't have a blender, you can use a fork first and finish the process by hand.
Roll the dough into a ball. Wrap in plastic wrap and refrigerate for 20–30 minutes.
Wash the apples. If the skin is thin, you don't need to peel it. Core them. Cut into wedges.
Place the chilled dough on parchment paper. Roll it out into a thin circle about 40 cm in diameter.
Transfer to a baking sheet along with the parchment.
Arrange the apple slices in a circle, starting from the center. Leave a 3–4 cm wide border.
Sprinkle the filling with 2 tablespoons of sugar and cinnamon. Place pieces of cold butter (20 g).
Fold the free edges inward and pinch.
Place the galette in a preheated oven. Bake at 220°C for 35–45 minutes.