Substitutes

Here are some useful Substitutes or Alternatives that I always struggle with:

HERBS

Basil: Oregano or Thyme

Tarragon: Parsley

Chive: Green onion or Onion or Leek

Cilantro: Parsley

Basil: Thyme

Mint: Basil or Marjoram or Rosemary

Oregano: Thyme or basil

Parsley: Chervil or Cilantro

Red Pepper: Paprika or Hot pepper sauce or Black pepper

Rosemary: Thyme or Tarragon

Black Pepper: Nutmeg

Italian Seasoning: Blend of any of these: basil, oregano, rosemary, and ground red pepper

Poultry Seasoning: Blend of any of these: thyme, black pepper, and rosemary

OTHERS 

Bread crumbs: Cracker crumbs or Crushed corn flakes
Cream of tartar: Vinegar or Lemon juice
Sour cream: Yogurt
Ghee: Clarified butter
Maple syrup: Honey
Buttermilk: Sour cream
Cornstarch: Cornflour or all purpose flour