The closest spread to peanut butter I've found in terms of flavor and texture is sunflower seed butter. It's also relatively easy to find; I've seen it in large chain grocery stores right next to the peanut butter.
A curmudgeon with years of practice. The bubbles in boiling water are steam or vaporized water. The bubbles initially do not reach the surface of the billing fluid as the colder water away from the hot bottom cools the steam turning it back to liquid. WHen all the water is at 100oC the bubbles reach the top.
The bubbles are the water vapor escaping. As substances warm up, they become less dense, and the less dense something is, theâ¦ less mass it has, so the water vapour rises to the top. Water in a pan or kettle bubbles like this because the source of heat is at the bottom, so the water near the bottom boils first.