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Preheat the oven to 200°C/400°F/Gas mark 6.
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Cut
the butter and lard into pieces and add these to the
flour in a large bowl with the salt. Mix until the
mixture resembles fine breadcrumbs. Add the water
and mix until it forms a smooth dough. Cover and
chill for 15 minutes.
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When the dough is cool, roll
out and use to line a 20cm/8in plain flan ring. Bake
in the preheated oven for 20 minutes.
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For the
filling, fry the onions and garlic in the oil in a
large saucepan for 10 minutes or until very soft but
not brown.
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Place the tomatoes in a bowl of just-boiled water
for 30 seconds. Remove the skin and seeds. Slice the
tomatoes, add to the pan and continue cooking for 10
minutes until the liquid has evaporated. Stir in the
tomato puree and thyme and season with salt and
pepper.
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Turn the mixture into the flan case. Brush
with a little oil and cook in the preheated oven for
20 minutes.
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When the flan is cooked, garnish with
olives and strips of anchovy fillet. This dish can
be served either hot or cold.