Here is a small list of herbs that provide bitterness, thyme, marjoram, lovage, rosemary, tarragon, bay leaves, sorrel, sage- If you want more bitterness and your recipe calls for these herbs- you might try increasing the amount of these herbs till you like the taste or achieve the result you are looking for, Alternatively- if you heat lemon juice it will tone down the actual lemon flavor and turn bitter. Sourness can be found in these foods- citrus fruits (such as lemon and limes), sour milk products (like yogurt, cheese, and sour cream), and fermented substances (including wine, vinegar, pickles, sauerkraut, and soy sauce). Again I would recommend that you simply increase the amounts of these foods in your recipe, Alternatively, I would recommend that you use a store bought artificial flavoring like lactic acid or fumaric acid, OR you could infuse regular white vinegar or a lightly flavored vinegar(such as apple cider or champagne vinegar) with fresh herbs(specifically one or more of those that are called for in your recipe.) I hope you get your condrumconundrum solved....:-)
