Generously grease sides of a 24cm round springform cake tin (base measurement) with olive oil, and line base with baking paper
Preheat oven to 200 degrees fan forced, and position rack into middle of oven
Place 120g cheddar into TM bowl and chop 4 seconds / speed 8, put aside, do not clean TM bowl
Add sourdough to TM bowl and chop 10 seconds / speed 8
Add 50g of the chopped cheese (keep balance for filling), along with the olive oil, salt and pepper and mix 5 seconds / reserve / speed 4 (this will combine the ingredients without chopping the bread any finer as you want it to be slightly chunky) – do not clean TM bowl as you will continue using it for the filling
Press the mix into the tin levelling it with the back of a spoon so that it covers the base evenly
Place into oven and bake 15 minutes, or until lightly toasted around the edges and the top looks firm, remove and put aside while you make the filling (it takes 15 minutes in my oven)
Place the sliced salami into the TM bowl and chop 5 seconds / speed 5, put aside
Add the ricotta, cream, 70g cheddar (from previously milled), eggs, cornflour, lemon zest, salt and pepper to the TM bowl and blend 30 seconds / speed 4
Scrape around bowl and repeat 30 seconds / speed 4 until well combined
Add the capers and use a spatula to swirl them around into the mix
Spread the mix over the sourdough base and use the back of a spoon to level the top
Sprinkle the salami over the top ensuring that you get a fairly even spread of it
Then dollop a few spoonfuls of the caramelised onions over the salami, then scatter over the chopped mint
Place tart in oven, and immediately reduce heat to 180 degrees fan, and bake 30 minutes, turn tart around and bake for a further 10 minutes until the top is lightly puffed and golden (it takes a total of 40 minutes in my oven)
Remove from oven and allow to rest 10 to 15 minutes before running a knife around the edge of the tin to release the ring
Use the baking paper to help slide the tart onto a cutting board
Sprinkle with extra mint leaves, cut into wedges and serve