I made this PPT to explain countable and uncountable nouns through saying "Can I have 1, a, 2, a few, some [insert countable noun i.e. apple/s, grape/s, chestnut/s]?"
"Can I have some, a little bit of [insert uncountable noun i.e. water, rice, juice, candy]?"
Then we played Pictionary. Two teams and one student from each team comes to the board and draws the food I whisper to them. The other students guess, but they must say the sentence "Can I have..." The students LOVED it. I made a list of foods: Kimbap, Kimchi, Jajangmyeong, Salad, Hamburger (have to use 'a' not 'some'), Rice, Samgyeopsal, Ddeokbokki, Corn, Cereal, ABC chocolate, Steak, Juice, Kimchi Jiggae, and Boshintang.