Sourdough bread
Bread leavened by a long-kept culture — slow, living supply built over time.
Sourdough bread in a dream is the dream's image of supply made by a long-kept living culture. The starter is older than the loaf; the bread is the visible piece of a process the baker has been tending for months or years. The dream brings sourdough when something in your life — a friendship, a skill, a household — is producing real, nourishing output because of a culture you have been quietly keeping alive. A loaf well-risen is the dream telling you the starter is healthy. A loaf that has not risen is the dream noting that the culture itself has weakened, and the next loaf will not be what the old ones were.