Onion Tart (TM5)
This onion tart is a classic French-inspired savoury bake with a golden olive oil pastry and a melting filling of softly cooked onions bound with sour cream. The Thermomix chops the onions in seconds and cooks them gently without burning. Finished with fresh chives and pepper, it works beautifully warm or cold.
About this recipe
Onion tart Thermomix TM7 style is the kind of humble French-inspired bake that turns a bag of everyday onions into something quietly spectacular. If you have been searching for onion tart recipes that rely on an all-in-one kitchen machine rather than an army of bowls and knives, this is it. The TM7 kneads the olive oil pastry in moments, chops the onions uniformly so they confit evenly, and cooks them slowly until sweet and jammy without a single scorched edge. The filling is nothing more than those onions folded through sour cream, seasoned with pepper and scattered with fresh chives after baking. Served warm with a green salad it makes a satisfying vegetarian main course; served at room temperature it becomes an excellent lunch or picnic bake. Because the pastry uses oil instead of butter, it stays tender and forgiving, even for nervous pastry makers. This is budget-friendly cooking that tastes far more luxurious than its ingredient list suggests, ideal for a quick weeknight dinner or a laid-back weekend table.
Preparation tips
- Slice the onions as uniformly as possible so they cook down evenly and turn sweet rather than mushy; the even pieces produced by the mixing bowl blade take the guesswork out of this step.
- Blind bake the olive oil pastry until it is just pale golden before adding the filling, which prevents the tart from developing a soggy base under the rich onion and sour cream mixture.
- Let the tart rest for ten minutes after baking before slicing into neat wedges, and scatter the fresh chives only at the last moment so they keep their bright colour and onion-free freshness.
Recipe variations
- Make it lactose-free by replacing the sour cream with a dairy-free alternative such as oat or soy based cream; the sweet onions carry the flavour, so the tart stays just as satisfying.
- For a festive Alsatian twist, add crispy lardons or smoked bacon bits to the onion filling and a handful of grated Gruyère on top before baking until bubbling and golden.
Thermomix TM7 Benefits
- Weigh the plain flour and olive oil directly into the mixing bowl, so the pastry ratio is exact without dirtying separate scales. [Precision Control]
- Kneading the oil pastry with the TM7 blade brings it together into a smooth, pliable dough within moments, no sticky hands needed. [Multi-Function]
- The Thermomix chops the onions evenly in seconds, saving ten minutes of tearful slicing by hand for this tart filling. [Time Savings]
- Heating the onions gently in the bowl cooks them into a sweet, golden confit without any burning or constant stirring. [Multi-Function]
- Whipping the sour cream with pepper and chives gives the tart filling a silky, evenly seasoned consistency before baking. [Multi-Function]
Ingredients
- plain flour
- olive oil
- water
- fine sea salt
- white onions
- red onions
- sour cream
- ground black pepper
- fresh chives