Every year when March rolls around, my aunt starts making these oven baked 3-ingredients lemon dill flounder rolls every single Friday. It started as her easy Lenten dinner, but it stuck because it’s so simple and light—perfect after a long workweek. You literally only need flounder, butter, and fresh dill, and the oven does the rest. The fillets get rolled up with a little butter and dill inside, then baked until they’re flaky and tender. It’s the kind of no-fuss recipe you can throw together after work and still feel like you made something special.
I like to serve these lemon dill flounder rolls with a simple side of steamed green beans or asparagus and a scoop of rice or buttered noodles to soak up the buttery dill juices from the pan. A crisp green salad with a lemony vinaigrette keeps everything light and bright. If you want to lean into the cozy Friday-night vibe, add a crusty baguette on the side so you can tear off pieces and swipe them through the buttery sauce in the baking dish.
Oven Baked 3-Ingredients Lemon Dill Flounder RollsServings: 4
Ingredients
1 1/2 pounds flounder fillets, thin and boneless
6 tablespoons unsalted butter, melted (plus a little extra for greasing the dish)
1/2 cup chopped fresh dill fronds, loosely packed
Directions
Preheat your oven to 375°F (190°C). Lightly grease a medium-sized white ceramic baking dish with a little bit of butter so the fish doesn’t stick.
Pat the flounder fillets dry with paper towels. This helps them roll more easily and lets the butter cling to the fish instead of sliding off.
Lay the flounder fillets flat on a cutting board or clean surface. If any pieces are very large, cut them in half lengthwise so you have manageable strips you can roll up.
Brush the top side of each fillet lightly with melted butter, using about half of the butter total. You don’t need to drench them—just a thin, even coat.
Sprinkle the chopped fresh dill evenly over the buttered side of the fillets, reserving a small pinch of dill to scatter over the top at the end before baking.
Starting from the thinner end of each fillet, gently roll it up into a loose spiral, keeping the dill on the inside. Don’t worry if they aren’t perfectly tight; they’ll snug up a bit as they bake.
Place each rolled fillet seam-side down in the greased ceramic baking dish, nestling them close together so they support each other and stay rolled.
Drizzle the remaining melted butter over the tops of the flounder rolls, making sure each one gets a little. Scatter the remaining pinch of chopped dill over the top for extra flavor and color.
Cover the baking dish loosely with foil and bake in the preheated oven for 10 minutes. This helps the fish steam gently and stay moist.
Remove the foil and continue baking for another 8–12 minutes, or until the flounder is opaque, flakes easily with a fork, and the butter around the rolls is gently bubbling. Thinner fillets will cook on the shorter end of the time range.
Carefully spoon some of the buttery dill juices from the bottom of the dish over the tops of the rolls right before serving. Serve the rolls straight from the baking dish while they’re hot and flaky.
Variations & Tips
If you only have frozen flounder, just thaw it completely and pat it very dry before rolling so it doesn’t water down the butter. You can swap in other thin, mild white fish like sole or tilapia if flounder isn’t available; just aim for fillets that are easy to roll. For a make-ahead option, you can roll the fillets with dill, arrange them in the baking dish, cover, and refrigerate for up to 6 hours, then add the melted butter and bake when you get home. If you prefer a touch of color, remove the foil a few minutes earlier and switch the oven to broil for 1–2 minutes at the end, watching closely so the fish doesn’t overcook. Leftovers reheat gently in a low oven (325°F/165°C) covered with foil for about 10 minutes, and they’re also great flaked over a salad the next day.
