Preheat the oven to 175 degrees Celsius.
Combine all the ingredients for the meatballs and mix until combined. But don't mix for too long.
Form 15-20 equally sized meatballs and put on a parchment covered baking sheet. Don't roll the meatballs for too long, just until you have formed round balls. Otherwise they might become to dense and dry.
Bake in the oven for 15-20 minutes, until golden brown. But don't take for too long so they become dry and boring. I prefer them with a little pink core, then you know they will be juicy and tasty.
Meanwhile combine the ingredients for the chimichurri in a bowl. Taste to check if more seasoning is needed. I prefer not to use that much olive oil and add some water instead, but you can adjust the amount of olive oil according to taste.
Next take the grated cucumber and squeeze out as much water as you can. Then add it to a bowl and combine with the rest of the ingredients and mix until combined.
Take out the meatballs from the oven and serve on top of the tsatsiki and drizzle with chimichurri.