Are we Machmir like the Taz that Kli Sheini causes Bliyos Uplitos unless it's Hefsed Meruba? Any Mareh Mekomos you have would be greatly appreciated. Thanks so much!
Answer:
The question of beliyos in a keli sheini is discussed by Rishonim, as brought in the Beis Yosef (Yoreh De'ah 105).
The Shulchan Aruch (105:2) writes that one should be stringent for the Rashba's opinion whereby there are beliyos (of a kelipah) for a keli sheini, but that bedieved one does not have to forbid the pot or the food (and there is no need even for "peeling off" the superficial layer - but one should wash off the food).
This is also the pesak of the Rema (68:11), though the Rema is also prepared to be lenient on a lechatchilah level, where there is a need such as for guests etc.
The Shach (105:5) writes that we are concerned in certain cases even on a bedieved level, unless there is a loss involved, though for metal utensils he is lenient for a bedieved level, whereas (as you note in the question) the Taz (and the Peri Chadash 68:18) are stringent (based on the Maharshal) for a beliya in the entire food. (see also Beis Meir, as cited in Darkei Teshuvah 105:62).
The principle halachah follows the opinions of the Shulchan Aruch and the Rema (as the Aruch HaShulchan 105:19 points out), and therefore one can be lenient bedieved.
Best wishes.
