a touch of and pore over
Some of my most wonderful memories of childhood are of spending time with my grandmother, Mamar, in our four-family home in Brooklyn, New York. Her apartment was an oasis. It was a place where I could sneak a cup of coffee, which was really warm milk with just a touch of caffeine. She loved life. And although she worked in a factory, she saved her pennies and she traveled to Europe. And I remember poring over those pictures with her and then dancing with her to her favorite music.
There are two phrases I don't understand, one is "a touch of .." , another is " poring over those picutres".
Thanks for help!