Heartwarming classics like rum babas demand to be spirited away. To create a gift that keeps on giving, we made 24 small bouncy cakes in mini muffin tins, popped them into Mason jars, added our gently alcoholized rum syrup and put a lid on them. Prêt-à-porter! Offer a few to neighbours and party hosts and keep a few for yourself. They can soak for up to three days and still retain their wonderfully light and spongy texture (as long as you occasionally flip the jar to keep all the babas moist.