The correct answers are If Chef Bob weren't so afraid of seasonings, the sauce wouldn't have tasted like warm tap water last night. and If Chef Bob knew how to use salt, his guests wouldn't have secretly ordered a pizza halfway through the meal.

This scenario uses a Mixed Conditional (Type 2), which connects a present, ongoing condition (Chef Bob's general fear of spices) to a past result (the ruined dinner last night). We use the past simple/subjunctive in the if-clause ("weren't" / "knew") and the perfect conditional in the main clause ("wouldn't have tasted" / "wouldn't have ordered").

"Wouldn't taste... last night" is incorrect because "last night" requires a past result ("wouldn't have tasted"). "If Chef Bob isn't..." is incorrect because we must use past tense forms to express an unreal or hypothetical present condition.