This is a from-scratch sweet potato burger — homemade patty, homemade brioche bun, sliced avocado on top. It takes about 70 minutes start to finish, and the honest reason to make it is that you control every ingredient. No mystery fillers, no freezer-aisle compromises.
Why this recipe works
Two things make this burger hold together instead of falling apart on the grill. First, cooking the sweet potato in salted water and mashing it while still warm means it absorbs the flour evenly — cold mash clumps and leaves dry pockets. Second, the baking soda in the brioche bun reacts with the lemon juice to give you lift without yeast, which cuts out the long proofing wait. The steam from the water-filled dish in the oven keeps the crust from setting too fast, so the buns stay soft inside while browning on the outside.
Smart swaps
- Amaranth topping: Popped amaranth is a small bag item that can be hard to find. Sesame seeds or rolled oats pressed into the top of the bun before baking work fine and behave the same way in the oven.
- Plant oil for frying: Any neutral high-smoke-point oil works — sunflower, canola, or refined avocado oil. Avoid extra-virgin olive oil here; it smokes before the patty browns.
- Teriyaki sauce: The recipe calls for it as a condiment. A good store-bought version is fine. If you want something lighter, a thin layer of sriracha mayo or plain mayo with a squeeze of lime works well with the avocado.
- Brioche bun: If you are short on time, a store-bought brioche bun is a reasonable stand-in. The homemade version is noticeably softer, but it is not the hill to die on if you are tired.
What can go wrong
- Patties fall apart in the pan: The mix is too wet. This usually means the sweet potato was not drained well enough after boiling. After mashing, spread it on a plate for a few minutes to let steam escape before adding the flour and egg.
- Buns come out dense and flat: The baking soda and lemon juice need to go into the dough quickly and get into the oven fast. If the dough sits too long after mixing, the reaction is spent and you lose the lift.
- Patties stick to the pan: The oil needs to be properly hot before the patties go in. Drop a small pinch of the mix into the oil — if it sizzles immediately, you are ready. A cold pan means the patty bonds to the surface before a crust can form.
- Garlic burns before the onion softens: Half a cup of chopped garlic is a lot, and garlic burns faster than onion. Add the onion first and give it two minutes before adding the garlic, even though the recipe combines them.
- Avocado browns before serving: Slice it right before assembly, not while the patties are still cooking. A squeeze of lemon juice on the cut surface buys you a few extra minutes if you need them.
Keeping and reheating
Store cooked patties and buns separately in the fridge. Patties keep well for up to 3 days in an airtight container. To reheat, use a dry non-stick pan over medium-low heat for about 3 minutes per side — the microwave turns them soft and a little gummy. For longer storage, freeze uncooked formed patties on a parchment-lined tray until solid, then transfer to a freezer bag; they keep for up to 2 months. Cook from frozen by adding an extra 3 to 4 minutes per side in the pan. Do not freeze the buns once baked; they go stale fast after thawing. Freeze unbaked dough portions instead and bake them fresh.
Vegetarian Sweet Potato Burger
Ingredients
Brioche Bun Ingredients
- 2 cups all-purpose flour
- 2 medium eggs
- 1 ¼ teaspoons baking soda
- 3 tablespoons lemon juice
- ¼ cup milk
- ¼ cup butter
- 1 small bag Amaranth topping
Sweet Potato Patty Ingredients
- 1 pound sweet potato
- 1 cup onion chopped
- ½ cup garlic chopped
- 1 cup all-purpose flour
- 1 medium egg
- 1 tablespoon butter for glazing
- 1 pinch salt to taste
- 1 pinch ground black pepper to taste
- ½ teaspoon Nutmeg
- ½ small lemon zest
- 1 ½ tablespoon plant oil
Toppings
- 1 medium avocado
Instructions
Brioche Bun Instructions
- Combine ½ cup of flour with the baking soda.
- Combine egg, lemon juice, butter, 1 ½ cups of flour and ¼ cup milk.
- Add flour-baking soda mixture to the rest. Knead thoroughly.
- Preheat the oven at 200°C upper and lower heat.
- Divide into two equal parts. Press the dough flat and fold the edges into the middle. Proceed by forming a ball in your hand. Press it flat again.
- Whisk an egg and coat the bun with it. Add some popped amaranth.
- Put a baking dish filled with water at the bottom of the oven. Bake the buns until brown (about 15 to 20 minutes).
Sweet Potato Patty Ingredients
- Cut up the onion and garlic. Glaze them with some butter in a pan on medium heat.
- Peel a sweet potato, cut it into small cubes and cook it in a pot with salted water until soft (5 to 10 minutes.)
- Mash the sweet potato. Add the garlic, onions, 1 cup of flour, 1 egg, some lemon zest, salt, pepper and nutmeg. Knead and form 2 patties.
- Heat some plant oil and fry the patties until slightly brown (about 5 minutes.)
Assembly Instructions
- Slice the avocado for topping.
- Add some Teriyaki sauce to the bottom bun. Add the patty and another layer of sauce. Add the avocado. Top off with the upper bun.
Nutrition
FAQ
Can I make the patties ahead of time?
Yes — form the patties, layer them between pieces of parchment, and refrigerate for up to 24 hours before frying. Chilling them actually helps them hold their shape better in the pan.
My sweet potato mix feels too sticky to shape. What do I do?
Add flour one tablespoon at a time until the mix holds a shape when pressed. Wet hands also help — dampen your palms before forming each patty and the mix will not stick as badly.
Do I really need the egg in the patty mix?
Skip the egg in the mix — it makes the patty mushy. The flour and the starch in the sweet potato are enough to bind everything together, and leaving the egg out gives you a firmer patty that browns more evenly.