Fry your own pancakes on a tabletop grill? With kids? Sounds like a lawsuit in the making. Slappy Cakes, however, adds a smart dose of Portland cool to the DIY concept, resulting in slam-packed weekend crowds. Think Stumptown coffee, local Foxfire tea, a surprisingly ambitious bar (a Pimm’s cup with house-grown muddled thyme!), and an all-day breakfast menu that stretches beyond flapjacks. But most folks are here for the Easy-Bake– meets–performance art family show: pick a batter, choose your sweet or savory fixins, and flip the switch on your table’s built-in griddle.