Seasoning is adding ingredients that bring out the flavours of other ingredients, spicing is different – it’s adding another flavour - so you season with salt and spice with pepper. Seasoning is basically salt or acid; lemon juice makes strawberries taste like strawberries and so does balsamic vinegar, salt, fish sauce, anchovies and other salty things enhance the flavour of other things: Nothing makes lamb taste like lamb more than those beautiful little fish fillets.