The sauce here is a bit salty when you taste it.

Literal

Here [genitive-の] sauce [topic-は] taste-try [conditional-と] little salty.

塩っぱい (しょっぱい) is the colloquial form of 塩辛い ('salty'), more everyday in spoken Japanese. 舐めてみる ('try tasting,' using ~てみる 'try to') is a common food-criticism construction. The ~と conditional here marks discovery ('when you try it, you find it's...'). ここのソース = 'the sauce here,' where ここの (genitive of ここ) modifies ソース.