A mild tomatillo sauce (“green sauce”) is what you should look into. Try some commercial stuff (which is generally medium heat) to see what range of flavors is

A mild tomatillo sauce (“green sauce”) is what you should look into. Try some commercial stuff (which is generally medium heat) to see what range of flavors is achievable. Note that when self made it can be accidentally end up with too much “vegetal” taste to it. It’s been a very long time since I’ve made it so I forgot what my resulting recipe was that addressed that.