can we say: the [STRIKE]buiscuits[/STRIKE] biscuits have such a peculiar taste that ... ?
You need the article "a".
A person can be said to have "peculiar taste" - it means that they like strange things!
If you're talking about how something actually tastes (the flavour), then you say it has "a peculiar taste".
Note correct spelling of biscuit, as amended above.