I'm cooking Marcella Hazan's bolognese/ragu recipe using a brand new Le Creuset 7-quart round dutch oven. For the long simmering stage, the recipe says to keep the heat very low, which is what I'm doing. I'm noticing that the bubbles are appearing only at the very center of the pot (presumably because the flame is so small). Around the edges, I'm able to dip my finger in the sauce and keep it submerged without burning, and I can touch the handles and sides of the pot, too. Is this temperature variation typical and/or acceptable? (I am stirring occasionally, so I guess that might help give everything a turn in the center.)
It tastes OK so far, but I'm just wondering if I should do something differently next time (e.g., using a pot with a smaller diameter or better conductivity, or even trying to simmer in the oven.)