few recipes: sour dough starter, pepper sauce and brown sauce (#434)

src/brown-sauce.md

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+# Brown Sauce
+
+A very basic sauce that can be used for various dishes.
+
+- ⏲️ Prep time: 5 min
+- 🍳 Cook time: 20 min
+- 🍽️ Servings: 6
+
+## Ingredients
+
+- 1 onion
+- 75g butter
+- 1dl flour
+- 1l bouillon
+- Black pepper freshly grounded
+
+## Directions
+
+1. Chop and sauté the onions and put the aside for a while
+2. Melt the butter on a pan and add the flour to it
+3. Brown the flour on medium heat until the mixture is dark brown
+4. Add the bouillon in small batches while stirring with a whisker
+5. Let the sauce boil and thicken for few minutes
+6. Add the onions and ground some pepper in the sauce
+7. (optional) Add preferred meat to the sauce or use as is
+
+## Contribution
+
+- Vili Kangas
+
+;tags: sauce meat