Heat oven to 220C/200C fan/gas 7.
Tip the potatoes into a large shallow
roasting tin and toss with 1 tsp olive oil
and some seasoning. Roast for 20 mins
until just starting to colour, then scatter
over the lardons and return to the oven
for 10 mins to crisp up.
Remove the tin from the oven, push the
potatoes and bacon to the sides and lay
the salmon in the middle. Brush with
remaining oil, season, then return to the
oven and cook for 20 mins more until
the salmon is just cooked through.
Meanwhile, cook the peas in boiling
water for 2 mins and drain.
When the fish is cooked, lift it to a
serving dish. Stir the peas and spring
onions through the potatoes, drizzle with
a splash of vinegar, stir through the mint
and season to taste. Spoon around the
salmon and serve.