“as I had promised them before” can be shortened to “just as I had promised them.” “everyone of them awed” should be “everyone was amazed.” “maybe because I add more coconut milk” needs past tense: “maybe because I added more coconut milk.” “keep it deep cold in the fridge” sounds more natural as “kept it very cold in the fridge.” “I also like it myself” should be in the past tense: “I also enjoyed it myself.”