Reading A1, Monuments, Tourism & Vacations, Family & Relationships, Listening or Seeing A1
Although adverbs don't normally agree with adjectives, tout is a rather weird exception. If it's followed by a feminine adjective beginning with a consonant or aspirated h, then it agrees in gender and number.
Your other question on le/la goûter has been answered here:
Thank you for clearing up something I found really confusing!
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