Start by cutting the chicken breast into strips then into smaller pieces.
In a large saucepan over medium to low heat, add the unsalted butter, a drizzle of vegetable oil and stir until the butter is completely melted.
Add the chicken we sliced earlier, the pickled cucumber juice and sauté until the juice is almost completely reduced.
Remove all the chicken from the pan, add the onion cut into round slices, the crushed garlic cloves and sauté until the onion wilts.
Add the pickled cucumbers cut into strips and sauté again.
Then, add all the chicken back in.
Season with the salt, a pinch of black pepper, the sweet paprika, the soy sauce, the mustard and stir to combine.
Now, dissolve the cornstarch in the water, add it to the pan and stir very well.
To finish, add parsley to taste.
Serve.