Identify what the paste is doing in your recipe: savory depth in sauces vs. salty lift in dressings vs. umami in baking.
Choose the substitute from the order that best matches flavor: fish sauce (closest), then Worcestershire, then anchovy powder, then capers + olive oil.
Apply the listed ratio and mix into warm fat (oil/butter) or warm liquid so the umami disperses evenly.
Adjust after tasting: if it’s too salty, reduce the amount next time; if it’s not “anchovy-like” enough, add a tiny pinch of extra umami (not more salt).
In baking, keep the swap small and taste the batter before adding dry ingredients so you don’t lock in excess salt.