private static Meal PreparePastry()
        {
            var res = new Meal("Pastry");

            res.AddPacking(new Cup(1, Ingredients.Cream));
            res.AddPacking(new Cup(0.5, Ingredients.SunFlowerOil));
            res.AddPacking(new Piece(1, Ingredients.Egg));
            res.AddPacking(new TableSpoon(1, Ingredients.Salt));
            res.AddPacking(new Cup(3, Ingredients.Flour));
            res.AddPacking(new Piece(1, Ingredients.BakingPowder));
            return(res);
        }
        private static Meal PreparePancake()
        {
            var res = new Meal("Pancake");

            res.AddPacking(new Piece(2, Ingredients.Egg));
            res.AddPacking(new Cup(1.75, Ingredients.Flour));
            res.AddPacking(new Cup(1, Ingredients.Water));
            res.AddPacking(new Cup(1, Ingredients.Milk));
            res.AddPacking(new TableSpoon(1, Ingredients.Salt));
            res.AddPacking(new Cup(0.5, Ingredients.SunFlowerOil));
            return(res);
        }