Help! Cream Question

[lolane]

Okay, I neglected to read the entire recipe before I began and here I am now trying to have fish tacos CRIVINS! homemade crema. The recipe called for 1 cup half and half, 1 cup heavy cream and 1 tablespoon sour cream. I didn't read the part where it said the mixture needed to sit 24 hours at room temperature to culture. I don't have 24 hours, so I am wondering is there a way to thicken this stuff up quicly?

Your help is much appreciated.

[Nimblicity]

Add something sour (dash of lemon juice, dash of vinegar)?  Shake it up?  Keep it warm, but not hot?

These are all guesses.  But something acidic will curdle/thicken any milk product, if that's what you want to happen.  I always do it when I make a banana-milk smoothie.  Mmmm...

[alli_wan]

probably way too late, but you could probably add plain yogurt.