Add mazurek (#549)

* Add mazurek

* Fix typo + describe albedo

src/mazurek.md

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+# Mazurek
+
+Mazurek is a traditional Polish flat cake made in many homes for Easter. Many
+different toppings are possible.
+
+## Ingredients
+
+* 2 1/2 cups flour
+* 1/4 cup powdered sugar
+* 200g (7 oz) butter
+* 1 tablespoon 18% sour cream
+* 2 egg yolks
+* topping: for example [orange jam](orange-jam.html) from 4 oranges
+* optional additional toppings/decorations:
+    * walnuts
+    * pecans
+    * raisins
+    * sliced almonds
+
+## Directions
+
+1. Put flour and butter in a bowl.
+2. Cut the butter with a sharp knife into tiny pieces, mixing with the flour.
+3. Add egg yolks, sugar, sour cream, and a pinch of salt.
+4. Knead well and form into a ball. Wrap in plastic wrap and let chill in fridge
+   for about an hour.
+5. Roll out flat and place in large baking sheet (this should be enough for a
+   25x35cm/10x14in sheet) on top of parchment paper.
+6. Make little holes with fork in the dough.
+7. Bake for 15-20 minutes in 200°C (395°F).
+8. Let cool before spreading topping.
+9. Decorate with nuts or other toppings.
+
+## Contribution
+
+- Martin Chrzanowski -- [website](https://m-chrzan.xyz), [donate](https://m-chrzan.xyz/crypto.html)
+
+;tags: polish easter traditional dessert

src/orange-jam.md

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+# Orange jam
+
+This jam is a traditional topping for the Polish [mazurek](mazurek.html), but
+can be used as a generic sweet spread.
+
+## Ingredients
+
+* 4 medium sized oranges
+* 1 lemon
+* 1 1/2 cup sugar
+
+## Directions
+
+1. Zest all fruit.
+2. Peel off the albedo (the white part under the skin).
+3. Blend the fruit (not too much, it doesn't need to become an even mush, just
+   cut up into small pieces).
+4. Combine the blended fruit, zest, and sugar in a pot.
+5. Bring to boil and boil for 30-40 minutes on low heat. The mixture will
+   thicken as water evaporates. Note that it will thicken even further once it
+   cools, so don't boil for too long - it is expected to be still a little runny
+   at the end of boiling.
+
+## Contribution
+
+- Martin Chrzanowski -- [website](https://m-chrzan.xyz), [donate](https://m-chrzan.xyz/crypto.html)
+
+;tags: jam fruit sweet spread